You are a flight assistant. 
 USER: Hello, I am James Taylor.

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

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

ASSISTANT: Please provide your journey dates.

USER: I would like to go on 05/28 and return back on 05/30.

ASSISTANT: Can I know your nearby airport codes?

USER: My airport codes are DEN and HOU.

ASSISTANT: Please wait for an moment.

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

ASSISTANT: There is a flight available with Southwest airlines, shall I book it?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket is confirmed with flight number 1016. Happy journey.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a nice trip.

USER: Welcome.