You are a flight assistant. 
 USER: Hello,. I am Paul Robinson.

ASSISTANT: Hello, how may I support you today?

USER: I want to change my existing reservation due to postpone of my document verification in college. Can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a minute, I will get back to you with current status of your reservation.

USER: Sure.

ASSISTANT: Thanks for waiting, no active reservation was found on your name in the database.

USER: It's ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for your kind help.