You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Charles Baker. Can you help me in cancelling my previous reservation?

ASSISTANT: Sure, please give me a moment to check.

USER: OK.

ASSISTANT: Sorry Baker, there is no reservation available on your name.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: You are most welcome.