diff --git a/crossfit_booker.py b/crossfit_booker.py
index 4bd3246..74adb63 100644
--- a/crossfit_booker.py
+++ b/crossfit_booker.py
@@ -513,6 +513,10 @@ class CrossFitBooker:
                 logging.info(f"Successfully booked {session_type} session at {session_time}")
             else:
                 logging.error(f"Failed to book {session_type} session at {session_time} - Session: {session}")
+                # Send notification about the failed booking
+                session_details = f"{session['name_activity']} at {session_time.strftime('%Y-%m-%d %H:%M')}"
+                await self.notifier.notify_impossible_booking(session_details)
+                logging.info(f"Notified about impossible booking for {session_type} session at {session_time}")
 
     async def run(self) -> None:
             """
diff --git a/session_notifier.py b/session_notifier.py
index 452e5d0..626a6d2 100644
--- a/session_notifier.py
+++ b/session_notifier.py
@@ -114,6 +114,24 @@ class SessionNotifier:
         email_message = f"Session available soon: {session_details} (in {days_until} days)"
         telegram_message = f"Session available soon: {session_details} (in {days_until} days)"
 
+        # Send notifications through enabled channels
+        if self.enable_email:
+            self.send_email_notification(email_message)
+
+        if self.enable_telegram:
+            await self.send_telegram_notification(telegram_message)
+
+    async def notify_impossible_booking(self, session_details):
+        """
+        Notify about an impossible session booking via email and Telegram.
+
+        Args:
+            session_details (str): Details about the session that couldn't be booked
+        """
+        # Create messages for both email and Telegram
+        email_message = f"Failed to book session: {session_details}"
+        telegram_message = f"Failed to book session: {session_details}"
+
         # Send notifications through enabled channels
         if self.enable_email:
             self.send_email_notification(email_message)