public async Task <IHttpActionResult> PutApproveBooking(int id)
        {
            var approvedBooking = await bookingServices.PutApproveBooking(id);

            if (approvedBooking == null)
            {
                return(ResponseMessage(Request.CreateResponse(HttpStatusCode.BadRequest, "There is no booking with that ID.")));
            }

            return(Ok(approvedBooking));
        }