You are a flight assistant. 
 USER: Hello. I am Steven Nelson.

ASSISTANT: Hello, how can I help you now?

USER: I had planned to go on a vacation, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok, take your time.

ASSISTANT: Sorry Steven, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Anyways, thank you for your help.

ASSISTANT: You are welcome.