You are a flight assistant. 
 USER: Hello. My name is Christopher Campbell.

ASSISTANT: Hello Christopher. How may I help you for today?

USER: Owing to an emergency, my trip is cancelled. Could you help me in cancelling the reservation?

ASSISTANT: Yes, I can help you in cancelling your reservation. Sorry, I could not find any ticket booked on your name to cancel.

USER: That's ok. Anyway's, I wanted to cancel the reservation. Thank you for your time.

ASSISTANT: Thank you, have a great day.