You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I aid you at this moment?

USER: My business trip has been postponed, can you please help me for changing the exiting reservation?

ASSISTANT: Yes, I will help you about it. Please, provide your name to check the reservation status.

USER: Sure, my name is Kevin Lee.

ASSISTANT: Sorry Lee, there is no reservation under your name to change.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Most welcome. Hope you have a great day.