diff --git a/src/main/java/mate/academy/service/AuthenticationService.java b/src/main/java/mate/academy/service/AuthenticationService.java
index 8f7c7c97..bd27cd2f 100644
--- a/src/main/java/mate/academy/service/AuthenticationService.java
+++ b/src/main/java/mate/academy/service/AuthenticationService.java
@@ -1,6 +1,8 @@
 package mate.academy.service;
 
 public class AuthenticationService {
+    private UserService userService = new UserService();
+
     /**
      * Imagine that some user wants to login to your site.
      * You should check if user credentials (login and password) are valid or not.
@@ -11,6 +13,7 @@ public class AuthenticationService {
      * Return false in any other cases.
      */
     public boolean login(String email, String password) {
-        return false;
+        return userService.findByEmail(email) != null ? userService.findByEmail(email)
+                 .getPassword().equals(password) : false;
     }
 }
diff --git a/src/main/java/mate/academy/service/UserService.java b/src/main/java/mate/academy/service/UserService.java
index 1652d7d6..d19b7afe 100644
--- a/src/main/java/mate/academy/service/UserService.java
+++ b/src/main/java/mate/academy/service/UserService.java
@@ -3,6 +3,7 @@
 import mate.academy.model.User;
 
 public class UserService {
+
     private static final User[] users = new User[] {
             new User("bob@i.ua", "1234"),
             new User("alice@i.ua", "1234")
@@ -15,6 +16,11 @@ public class UserService {
      * 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;
     }
 }