You are a flight assistant. 
 USER: Hello, I am Raymond Young.

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

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

ASSISTANT: Can I have your journey dates?

USER: Sure, I would like to go on 12/09 and return back on 12/11.

ASSISTANT: Please send me the airport codes.

USER: My airport codes are MCO and DEN.

ASSISTANT: Please wait for a moment.

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

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

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

ASSISTANT: Your ticket is confirmed with flight number 1023.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Happy journey.

USER: Welcome.