You are a flight assistant. 
 USER: Hello, I am Steven Roberts.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure. Please share your journey dates.

USER: I would like to go on 03/20 and return back on 03/22.

ASSISTANT: Can I have your nearby airport codes?

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

ASSISTANT: Please wait for a moment.

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

ASSISTANT: There is a flight available with Frontier airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 1000.

ASSISTANT: Your booking is done with flight number 1007. Happy journey.

USER: Thank you for booking.

ASSISTANT: Welcome. Thank you for reaching us, have a nice day.

USER: Welcome.