You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what help that I can do for you?

USER: I am Jack Johnson. Can you help me in changing my recent reservation, as my interview is postponed?

ASSISTANT: Sure, I am oblige to help you in ticket modification process.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our data base to modify your flight ticket booking.

USER: That's ok, thank you.

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