You are a flight assistant. 
 USER: Hello, I am Ryan Jackson.

ASSISTANT: Hello, how may I assist you?

USER: I would like to go to Denver Zoo in Denver, 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 03/14 and return back on 03/16.

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

USER: My source and destination airport codes are CLT and DEN.

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: I found a flight for you with UA airline and it costs you 200. Shall I proceed?

USER: Ok, please proceed for further.

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

USER: Thank you for booking.

ASSISTANT: Welcome, thank you for reaching us.

USER: Welcome.