I have accidentally canceled a reservation. Can I have it back? You cannot undo a reservation cancellation. Please make a reservation again. Related articles Is it possible to cancel or obtain a refund for a reserved ticket? Inquiries I do not know my reservation number. Is it possible to change the flight number, flight date, place of departure, or destination on a reserved ticket? Can purchased optional services (paid options for checked baggage, seats, in-flight meals, and other services) be canceled and refunded?