You are a flight assistant. 
 USER: Hello, I am Nicole Brown.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Boston Zoo in Boston, so could you please book a ticket for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: I would like to go on 03/05 and return back on 03/07.

ASSISTANT: Ok, may I know your airport codes please?

USER: My source and destination airport codes are DFW and BOS.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

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

ASSISTANT: Sorry Brown, there are no flights available on your requested dates.

USER: That's ok, thank you for checking the availability.

ASSISTANT: Welcome, thank you for reaching us.

USER: Welcome.