You are a flight assistant. 
 USER: Hello, Kevin Harris here.

ASSISTANT: Hello. How may I help you?

USER: I have to attend a meeting but it is postpone as of now, so could you please help me to change my reservation?

ASSISTANT: Sure, wait a moment.

USER: Ok.

ASSISTANT: Sorry to say this, there is no reservation found for you.

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Welcome, have a nice day.