You are a flight assistant. 
 USER: Hello, Margaret Davis here.

ASSISTANT: Hello. How can I help you?

USER: Recently, I had booked a ticket to visit my friend, but, the trip got postponed. Could you change my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: No reservation found on your name Margaret Davis.

USER: Ok, thank you for your information.

ASSISTANT: You are welcome.