You are a flight assistant. 
 USER: Hello, I am William Walker.

ASSISTANT: Hello, how may I help you?

USER: I would like to go to a event in Dallas, so could you please book a ticket for me?

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

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

ASSISTANT: Let me know your trip dates please.

USER: I would like to go on 10/11 and return back on 10/13.

ASSISTANT: There is a flight available for you in UA airline with 1 connection. Shall I proceed with the booking?

USER: Ok, please proceed for booking if it costs you below 500.

ASSISTANT: Ok, the cost is only 200 and your ticket is booked.

USER: Thank you for booking.

ASSISTANT: Most welcome.