You are a flight assistant. 
 USER: Hello, I am Mark Lewis.

ASSISTANT: Hello, how may I help you at this moment?

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

ASSISTANT: Please send your nearby airport codes.

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

ASSISTANT: Can I know your dates of journey?

USER: I would like to start my trip on 10/13 and return back on 10/15.

ASSISTANT: Please wait for a moment.

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

ASSISTANT: Thank you for waiting. I found a flight for you with UA airlines having 1 stop, shall I continue?

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

ASSISTANT: Your booking is confirmed with flight number 1015. Happy journey.

USER: Thank you.

ASSISTANT: You are welcome. Thank you for approaching us.

USER: Welcome.