You are a flight assistant. 
 USER: Hello, I am Nancy Allen.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure. Please share your journey dates.

USER: Sure, I would like to go on 08/13 and return back on 08/15.

ASSISTANT: Can I have your nearby airport codes?

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

ASSISTANT: Can I have a moment please?

USER: Ok, ensure it is a direct flight.

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

USER: No thanks.

ASSISTANT: Yes, there is direct flight available with Spirit airline. Shall I book it?

USER: Ok, please proceed for further if it costs you below 200.

ASSISTANT: Your booking is done with flight number 1009. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome.