diff --git a/src/main/java/mate/academy/service/AuthenticationService.java b/src/main/java/mate/academy/service/AuthenticationService.java
index 8f7c7c975..7ffcc160f 100644
--- a/src/main/java/mate/academy/service/AuthenticationService.java
+++ b/src/main/java/mate/academy/service/AuthenticationService.java
@@ -1,16 +1,14 @@
 package mate.academy.service;
 
+import mate.academy.model.User;
+
 public class AuthenticationService {
-    /**
-     * Imagine that some user wants to login to your site.
-     * You should check if user credentials (login and password) are valid or not.
-     * All users are stored in <code>UserService</code> class.
-     * @param email - user's email
-     * @param password - user's password
-     * @return true if user by email exists and passed password is equal to user's password.
-     * Return false in any other cases.
-     */
+    private UserService userService = new UserService();
+
     public boolean login(String email, String password) {
-        return false;
+
+        User user = userService.findByEmail(email);
+
+        return user != null && user.getPassword().equals(password);
     }
 }
diff --git a/src/main/java/mate/academy/service/UserService.java b/src/main/java/mate/academy/service/UserService.java
index 1652d7d68..98c20549b 100644
--- a/src/main/java/mate/academy/service/UserService.java
+++ b/src/main/java/mate/academy/service/UserService.java
@@ -3,18 +3,17 @@
 import mate.academy.model.User;
 
 public class UserService {
-    private static final User[] users = new User[] {
+    private static final User[] users = new User[]{
             new User("bob@i.ua", "1234"),
             new User("alice@i.ua", "1234")
     };
 
-    /**
-     * Find user by email. All users are stored in <code>private static final User[] users</code>
-     * @param email - the input parameter
-     * @return - user if his email is equal to passed email.
-     * Return <code>null</code> if there is no suitable user
-     */
     public User findByEmail(String email) {
+        for (User user : users) {
+            if (user.getEmail().equals(email)) {
+                return user;
+            }
+        }
         return null;
     }
 }