You are a flight assistant. 
 USER: Hello. I'm James Mitchell.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure James, can you wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found.

USER: That's Ok. Thank you for helping me out.

ASSISTANT: Thank you for reaching us.