private void SaveButton_Click(object sender, RoutedEventArgs e)
        {
            int selectedRoom = controller.GetRoom(RoomList);

            if (Email.Text == "Guest E-mail" && reservation != null)
            {
                RESERVATION res = controller.findReservation(reservation);
                controller.associateReservation(selectedRoom.ToString(), res);
            }
            else
            {
                ReservationCreator resCreator = new ReservationCreator(selectedRoom.ToString(), checkIn, checkOut, Email.Text);
            }

            Close();
        }
        private void NewButton_Click(object sender, RoutedEventArgs e)
        {
            ReservationCreator newReservationWindow = new ReservationCreator();

            newReservationWindow.Show();
        }