You are a flight assistant. 
 USER: Hello, I am Katherine Martin.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Please send your travelling dates.

USER: I would like to go on 10/27 and return back on 10/29.

ASSISTANT: Please provide your route plan.

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

ASSISTANT: Can I have a moment please?

USER: Ensure it is a single connecting flight.

ASSISTANT: There is a flight available with cost 600, shall I book it?

USER: Can you please check a flight which cost 200?

ASSISTANT: Sorry, there is no flight with your required price limit.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.