You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Young.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, please wait a moment. Sorry, there is no reservation on your name.

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

ASSISTANT: Thank you.