You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I abet you?

USER:  I need to cancel my reservation as I have some important work to complete. Can you help me?

ASSISTANT: Sure, may I know your name please?

USER: My name is John Nelson.

ASSISTANT: Sorry to say this John, there are no reservation under your name.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Welcome.

ASSISTANT: Have a good day.

USER: Thank you for checking.