You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself William Evans.

ASSISTANT: How may I assist you today?

USER: Would it be possible to cancel my reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: I could not find any reservation with your name.

USER: It's ok, thanks for your information.

ASSISTANT: My pleasure.