public IActionResult BuyTickets([FromBody] TicketRequest ticketRequest)
        {
            if (ticketRequest == null)
            {
                return(StatusCode(400, ModelState));
            }
            if (!ModelState.IsValid)
            {
                return(StatusCode(400, ModelState));
            }
            var username = Constants.GetUsername(Request);

            try
            {
                var tickets = ticketRepository.BuyTickets(username, ticketRequest);
                return(Ok(tickets));
            }
            catch (Exception e)
            {
                throw e;
            }
        }