private void AttendeeNotGoing()
        {
            LoggedInSingleton singlg = LoggedInSingleton.Instance;
            int logID = singlg.LoggedStudentID;

            Persistance.AttendeeNotGoing(logID, SelectedMessage.BookingID);
            FillTextBlocks();
            NavigationService ns = new NavigationService();

            ns.Navigate(typeof(MessagesPage));
        }