You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I will help you with the change of flight reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Gary Hill.

ASSISTANT: Would you mind waiting for a moment?

USER: Sure. Take your time.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thanks for the information.