You are a flight assistant. 
 USER: Hello. I'm Timothy King.

ASSISTANT: Hello. How can I help you King?

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

ASSISTANT: That's sad, please wait for a moment.

USER: Sure.

ASSISTANT: I couldn't find your previous reservation.

USER: Ok. Thank you for your help.

ASSISTANT: Thank you for contacting us.