diff --git a/teos/proto/teos/v2/appointment.proto b/teos/proto/teos/v2/appointment.proto
index 67c66797..0d09086d 100644
--- a/teos/proto/teos/v2/appointment.proto
+++ b/teos/proto/teos/v2/appointment.proto
@@ -4,9 +4,10 @@ package teos.v2;
 import "common/teos/v2/appointment.proto";
 
 message GetAppointmentsRequest {
-  // Request the information of appointments with specific locator.
+  // Request the information of appointments with specific locator and user_id (optional) .
 
   bytes locator = 1;
+  bytes user_id = 2;
 }
 
 message GetAppointmentsResponse {
diff --git a/teos/src/api/internal.rs b/teos/src/api/internal.rs
index 38396bc0..2df4d052 100644
--- a/teos/src/api/internal.rs
+++ b/teos/src/api/internal.rs
@@ -2,7 +2,6 @@ use std::sync::{Arc, Condvar, Mutex};
 use tonic::{Code, Request, Response, Status};
 use triggered::Trigger;
 
-use crate::extended_appointment::UUID;
 use crate::protos as msgs;
 use crate::protos::private_tower_services_server::PrivateTowerServices;
 use crate::protos::public_tower_services_server::PublicTowerServices;
@@ -280,27 +279,40 @@ impl PrivateTowerServices for Arc<InternalAPI> {
                 .map_or("an unknown address".to_owned(), |a| a.to_string())
         );
 
-        let mut matching_appointments = vec![];
-        let locator = Locator::from_slice(&request.into_inner().locator).map_err(|_| {
+        let req_data = request.into_inner();
+        let locator = Locator::from_slice(&req_data.locator).map_err(|_| {
             Status::new(
                 Code::InvalidArgument,
                 "The provided locator does not match the expected format (16-byte hexadecimal string)",
             )
         })?;
 
-        for (_, appointment) in self
+        let mut appointments: Vec<(UserId, Appointment)> = self
             .watcher
             .get_watcher_appointments_with_locator(locator)
+            .into_values()
+            .map(|appointment| (appointment.user_id, appointment.inner))
+            .collect();
+
+        let user_id_slice = req_data.user_id;
+        if !(&user_id_slice.is_empty()) {
+            let user_id = UserId::from_slice(&user_id_slice).map_err(|_| {
+                Status::new(
+                    Code::InvalidArgument,
+                    "The Provided user_id does not match expected format (33-byte hex string)",
+                )
+            })?;
+            appointments.retain(|(appointment_user_id, _)| *appointment_user_id == user_id);
+        }
+
+        let mut matching_appointments: Vec<common_msgs::AppointmentData> = appointments
             .into_iter()
-        {
-            matching_appointments.push(common_msgs::AppointmentData {
+            .map(|(_, appointment)| common_msgs::AppointmentData {
                 appointment_data: Some(
-                    common_msgs::appointment_data::AppointmentData::Appointment(
-                        appointment.inner.into(),
-                    ),
+                    common_msgs::appointment_data::AppointmentData::Appointment(appointment.into()),
                 ),
             })
-        }
+            .collect();
 
         for (_, tracker) in self
             .watcher
@@ -511,7 +523,10 @@ mod tests_private_api {
 
         let locator = Locator::new(get_random_tx().txid()).to_vec();
         let response = internal_api
-            .get_appointments(Request::new(msgs::GetAppointmentsRequest { locator }))
+            .get_appointments(Request::new(msgs::GetAppointmentsRequest {
+                locator,
+                user_id: Vec::new(),
+            }))
             .await
             .unwrap()
             .into_inner();
@@ -519,6 +534,86 @@ mod tests_private_api {
         assert!(matches!(response, msgs::GetAppointmentsResponse { .. }));
     }
 
+    #[tokio::test]
+    async fn test_get_appointments_with_and_without_user_id() {
+        // setup
+        let (internal_api, _s) = create_api().await;
+        let random_txn = get_random_tx();
+        let (user_sk1, user_pk1) = get_random_keypair();
+        let user_id1 = UserId(user_pk1);
+        let (user_sk2, user_pk2) = get_random_keypair();
+        let user_id2 = UserId(user_pk2);
+        internal_api.watcher.register(user_id1).unwrap();
+        internal_api.watcher.register(user_id2).unwrap();
+        let appointment1 =
+            generate_dummy_appointment_with_user(user_id1, Some(&random_txn.clone().txid()))
+                .1
+                .inner;
+        let signature1 = cryptography::sign(&appointment1.to_vec(), &user_sk1).unwrap();
+        let appointment2 =
+            generate_dummy_appointment_with_user(user_id2, Some(&random_txn.clone().txid()))
+                .1
+                .inner;
+        let signature2 = cryptography::sign(&appointment2.to_vec(), &user_sk2).unwrap();
+        internal_api
+            .watcher
+            .add_appointment(appointment1.clone(), signature1)
+            .unwrap();
+        internal_api
+            .watcher
+            .add_appointment(appointment2.clone(), signature2)
+            .unwrap();
+
+        let locator = &appointment1.locator;
+
+        // returns all appointments if user_id is absent
+        let response = internal_api
+            .get_appointments(Request::new(msgs::GetAppointmentsRequest {
+                locator: locator.clone().to_vec(),
+                user_id: Vec::new(),
+            }))
+            .await
+            .unwrap()
+            .into_inner();
+        let dummy_appointments = response.appointments;
+        assert_eq!(&dummy_appointments.len(), &2);
+        let responses: Vec<Vec<u8>> = dummy_appointments
+            .into_iter()
+            .filter_map(|data| {
+                if let Some(common_msgs::appointment_data::AppointmentData::Appointment(
+                    appointment,
+                )) = data.appointment_data
+                {
+                    return Some(appointment.locator);
+                }
+                return None;
+            })
+            .collect();
+        assert_eq!(responses[0], locator.clone().to_vec());
+        assert_eq!(responses[1], locator.clone().to_vec());
+
+        // returns specific appointments if user_id is absent
+        let response = internal_api
+            .get_appointments(Request::new(msgs::GetAppointmentsRequest {
+                locator: locator.clone().to_vec(),
+                user_id: user_id1.clone().to_vec(),
+            }))
+            .await
+            .unwrap()
+            .into_inner();
+        let dummy_appointments = response.appointments;
+        assert_eq!(&dummy_appointments.len(), &1);
+        let dummy_appointmnets_data = &dummy_appointments[0].appointment_data;
+        assert!(
+            matches!(dummy_appointmnets_data.clone(), Some(common_msgs::appointment_data::AppointmentData::Appointment(
+            common_msgs::Appointment {
+                locator: ref app_loc,
+                ..
+            }
+        )) if app_loc.clone() == locator.to_vec() )
+        )
+    }
+
     #[tokio::test]
     async fn test_get_appointments_watcher() {
         let (internal_api, _s) = create_api().await;
@@ -548,6 +643,7 @@ mod tests_private_api {
             let response = internal_api
                 .get_appointments(Request::new(msgs::GetAppointmentsRequest {
                     locator: locator.to_vec(),
+                    user_id: Vec::new(),
                 }))
                 .await
                 .unwrap()
@@ -599,6 +695,7 @@ mod tests_private_api {
             let response = internal_api
                 .get_appointments(Request::new(msgs::GetAppointmentsRequest {
                     locator: locator.to_vec(),
+                    user_id: Vec::new(),
                 }))
                 .await
                 .unwrap()
@@ -747,7 +844,10 @@ mod tests_private_api {
 
         assert_eq!(response.available_slots, SLOTS - 1);
         assert_eq!(response.subscription_expiry, START_HEIGHT as u32 + DURATION);
-        assert_eq!(response.appointments, Vec::from([appointment.inner.locator.to_vec()]));
+        assert_eq!(
+            response.appointments,
+            Vec::from([appointment.inner.locator.to_vec()])
+        );
     }
 
     #[tokio::test]
diff --git a/teos/src/cli.rs b/teos/src/cli.rs
index 3ef1d9ff..5ef9928f 100644
--- a/teos/src/cli.rs
+++ b/teos/src/cli.rs
@@ -75,11 +75,21 @@ async fn main() {
             println!("{}", pretty_json(&appointments.into_inner()).unwrap());
         }
         Command::GetAppointments(appointments_data) => {
+            let mut user_id = Vec::new();
+            if let Some(i) = &appointments_data.user_id {
+                match UserId::from_str(i.as_str()) {
+                    Ok(parsed_user_id) => {
+                        user_id = parsed_user_id.to_vec();
+                    }
+                    Err(err) => handle_error(err),
+                }
+            }
             match Locator::from_hex(&appointments_data.locator) {
                 Ok(locator) => {
                     match client
                         .get_appointments(Request::new(msgs::GetAppointmentsRequest {
                             locator: locator.to_vec(),
+                            user_id,
                         }))
                         .await
                     {
diff --git a/teos/src/cli_config.rs b/teos/src/cli_config.rs
index ba085b8d..8c23c467 100644
--- a/teos/src/cli_config.rs
+++ b/teos/src/cli_config.rs
@@ -31,6 +31,8 @@ pub struct GetUserData {
 pub struct GetAppointmentsData {
     /// The locator of the appointments (16-byte hexadecimal string).
     pub locator: String,
+    /// The user identifier (33-byte compressed public key).
+    pub user_id: Option<String>,
 }
 
 /// Holds all the command line options and commands.