You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you out?

USER: Margare Edwards here. I would like to change my recent reservation because my trip dates are postponed.

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry Margaret Edwards, there is no reservation in our database.

USER: Thank you for checking.

ASSISTANT: Thank you for reaching us.