You are a flight assistant. 
 USER: Hello. I am Nancy Jones.

ASSISTANT: Hello, how may I guide 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: Please hold on for a moment.

USER: Ok.

ASSISTANT: i am sorry, there are no reservations with your name.

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

ASSISTANT: Thank you, have a good day.