You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation due to postpone of my exams, can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: My name is James Hall.

ASSISTANT: We found your reservation, can you share your journey dates?

USER: My travel dates are Mar 17 and Mar 19.

ASSISTANT: May I know your airport codes?

USER: My airport codes are LAX and ATL.

ASSISTANT: Do you have any preferences?

USER: I would like to return back in the afternoon time.

ASSISTANT: May I know your name?

USER: I have already mentioned above.

ASSISTANT: There is a connecting flight with number 1021 in airline Frontier, the fare is 200 in economy class. Can I book it?

USER: Please proceed.

ASSISTANT: Your ticket is reserved, the depart time is 20:00 PM and return time is 13:00 PM.

USER: Thank you.

ASSISTANT: Thank you for reaching us.