You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I best assist you now?

USER: I want to change my existing reservation due to postponed of my document verification in college. Can you please assist me with this?

ASSISTANT: Sure, I can change your reservation right now.

USER: Thank you.

ASSISTANT: Before that I need to know your good name please?

USER: Sure, Thomas Parker is my name.

ASSISTANT: Ok, just give me a minute please.

USER: Sure.

ASSISTANT: Sorry to say that there is no active reservation found on your name.

USER: That's fine, not a problem. Thank you.

ASSISTANT: Thanks for opting us, wish you a great day.