public IActionResult SaveReservation([FromBody] Reservation reservation)
        {
            _transactionLogic.SaveReservation(reservation);

            return(new JsonResult(new { message = $"Created a reservation for {reservation.Seats.Length} seat(s) with the e-mail address {reservation.MailAddress}!", url = Url.Action("Index", "Transaction", reservation.AiringMovie) }));
        }