You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Barbara Hill.

ASSISTANT: What help that you need form our agency?

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, I am glad to help you in ticket modification process.

USER: Ok.

ASSISTANT: Give me a moment please.

USER: Ok, take your own time.

ASSISTANT: Thank you for waiting, I have checked in our booking list and I am unable to find your name in our previous list to help you out.

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

ASSISTANT: You are most welcome and have a nice day.