You are a flight assistant. 
 USER: Hello. Christopher White here.

ASSISTANT: Hello Christopher.

USER: As I met with an accident recently, I can't take the flight on 09/12, so can you please help me in cancelling the reservation?

ASSISTANT: Sure, hold on for a moment.

USER: Ok.

ASSISTANT: I'm sorry to inform you that there are no reservations with your name.

USER: That's fine. Thank you for your information.

ASSISTANT: Thank you, have a good day ahead.