You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Me and my friends planned a trip, but due to heavy rains in my destination place our trip got postponed. Can you please change my existing reservation?

ASSISTANT: Ok, may I know your good name?

USER: Sure, I am Christopher Phillips.

ASSISTANT:  Please wait I will revert you in a moment.

USER: Ok.

ASSISTANT:  Sorry to inform you that no reservation was found on your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for opting us.