You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that I can assist you?

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

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Can I know your name for checking purpose?

USER: My name is Frank Johnson.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found for the user name in our data base to help you with cancellation process.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are most welcome.