You are a flight assistant. 
 USER: Hello, I am Frank Davis.

ASSISTANT: Hello, Frank Davis. How may I help you?

USER: I want to cancel my reservation, can you help me with it?

ASSISTANT: Sure, please wait a moment, I will revert to you.

USER: OK.

ASSISTANT: Thanks for your time. No reservation is existed earlier to proceed with cancellation.

USER: No problem, thank you.

ASSISTANT: Thanks for your time, Have a nice day.