You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am William Martin. Would it be possible to cancel my reservation?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation with your name to cancel further.

USER: It's ok, thanks for checking.

ASSISTANT: You are welcome.