You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency, I would like to cancel my trip. Can you please cancel my reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Amy Walker.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Amy, your reservation has been cancelled successfully.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing our service.