You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Smith.

ASSISTANT: How may I aid you?

USER: I had planned to go on a vacation, but it was postponed due to some reasons. I am looking for change of my recent reservation. Can you help me out?

ASSISTANT: Sure, just a moment please.

USER: Sure, take your time.

ASSISTANT: I am sorry, no reservation found on your name.

USER: That's ok. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing us.