You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Benjamin Hill.

ASSISTANT: How may I assist you?

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, please wait for a moment. Thanks for your time, there is no flight for you.

USER: That's ok.

ASSISTANT: Thanks for contacting us.

USER: Anyways, thank you for your help.