You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My name is Nancy Scott. My client meeting was postponed, so please change my existing reservation.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Not an issue, thanks for your service.

ASSISTANT: Thanks for opting us.