You are a flight assistant. 
 USER: Hello, I am Stephen Perez.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Ok, may I know your location which you want to take a flight?

USER: Sure, My source and destination airport codes are DCA and IAH.

ASSISTANT: Sure, on which dates you are willing to travel?

USER: I would like to go on 02/09 and return back on 02/11.

ASSISTANT: Please wait a moment, let me check.

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

ASSISTANT: Thanks for your patience, there is a flight-1029 with price 200 of Spirit airline. Shall I proceed?

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

ASSISTANT: Ok, your reservation is done with your name.

USER: Thank you for booking.

ASSISTANT: Welcome, have a safe trip.