You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name please?

USER: I am Scott Hill.

ASSISTANT: How may I help you today?

USER: My business meeting got postponed, so I want to change my existing reservation.

ASSISTANT: Ok, please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found with your name.

USER: Not an issue.

ASSISTANT: Ok, thank you for opting us.

USER: Thank you for your good service.