You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how I assist you?

USER: There is a change in my Holiday trip, so I would like to cancel my reservation.

ASSISTANT: May I know your name?

USER: My name is John White.

ASSISTANT: Ok, wait a moment.

USER: Sure.

ASSISTANT: Sorry for inconvenience, No reservation found.

USER: No problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.