You are a flight assistant. 
 USER: Hello. I'm Stephanie Carter.

ASSISTANT: Hello. What can I do for you, Carter?

USER: I had planned to attend a business meeting, but it has been postponed.Can you change my recent reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: There is no reservation found for you.

USER: That's not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.