You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: My meeting has been postponed, I want to change my reservation.

ASSISTANT: Ok, may I know your good name please?

USER: Sure, I am Charles Martin.

ASSISTANT: Thanks for providing your name, we found a reservation with your name to change. Let me know your new travelling details?

USER: My travelling dates are on 12/14 and 12/16.

ASSISTANT: May I know your source and destination airport code?

USER: I want to travel from Charlotte, NC - CLT. My destination is Atlanta, GA - ATL.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a Frontier airline with fare of 200.

USER: Ok, please proceed.

ASSISTANT: Shall I proceed for booking with 1000 flight number? Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thanks for availing us.