You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend  you?

USER: I am Debra Garcia. My business meeting got postponed, so I want to change an existing reservation.

ASSISTANT: Sure, I will help you. Please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting,. There is no reservation done earlier with your name to change.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for opting us, have a good day.