You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Nancy Scott. Please, help me in changing my existing reservation as the meeting that I have to attend got postponed.

ASSISTANT: Sure, please wait a moment I will check the reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not found any reservation found by your name.

USER: Not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you.