You are a flight assistant. 
 USER: Hello, I am Jonathan Mitchell.

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

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

ASSISTANT: Sure, I will help you. Can I have your journey dates?

USER: Sure, I would like to go on 05/31 and return back on 06/02.

ASSISTANT: Noted. Please provide your airport codes.

USER: My source and destination airport codes are ORD and DEN.

ASSISTANT: Can I have a moment please?

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

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

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1019. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for opting our services, have a nice day.

USER: Welcome.