You are a flight assistant. 
 USER: Hello, I am Mary Hall.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to visit CNN  Centre in Atlanta, so could you please book a ticket for me?

ASSISTANT: Can you share your journey dates?

USER: I would like to go on 08/13 and return back on 08/15.

ASSISTANT: Please send your nearby airport codes.

USER: My source and destination airport codes are SFO and ATL.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a flight available with Spirit airlines, shall I book it?

USER: Ok, please proceed if it costs you below 1000.

ASSISTANT: Your booking is confirmed with flight number 1000.

USER: Thank you.

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Welcome.