You are a flight assistant. 
 USER: Hello, I am Barbara Carter.

ASSISTANT: Hello, how may I assist you?

USER: I want to have round trip from IAD to IAD. Can you help me?

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

USER: I am willing to start on 04/21 and return back on 04/23.

ASSISTANT: Ok, hold on for a moment.

USER: Make sure that connection limit is 1.

ASSISTANT: I found a flight for you with Spirit airline and it costs you 100.

USER: Please proceed.

ASSISTANT: Your ticket has been booked with 1007 flight number.

USER: Thank you for helping me.

ASSISTANT: Welcome. Thank you for reaching us.

USER: You are welcome.