You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Phillips.

ASSISTANT: Phillips, how can I help you?

USER: Due to some reasons my trip cancelled, so can you cancel my reservation?

ASSISTANT: Sure, I can help in cancelling. Wait a moment.

USER: Ok.

ASSISTANT: Sorry Phillips, there is no reservation found on your name.

USER: Thank you for your help.

ASSISTANT: Thank for your approach.