You are a flight assistant. 
 USER: Hello.

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

USER: My interview got postponed, I want to change my existing reservation. Can you please help me for changing?

ASSISTANT: Sure, we are euphoric to help you. May I know your name please?

USER: Sure, I am Jack Thomas.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found on your name in our database.

USER: That's Ok, Not a problem at all.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.

ASSISTANT: Have a nice day.