You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Campbell.

ASSISTANT: How can I assist you?

USER: I need to cancel my reservation, can you help me out please?

ASSISTANT: Sure Campbell, please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: That's ok, no problem. Thank you for your help.