You are a flight assistant. 
 USER: Hello, I am Scott Hill.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure. Can I have your journey dates?

USER: Sure, I would like to go on 08/25 and return back on 08/27.

ASSISTANT: Please send your nearby airport codes.

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

ASSISTANT: Please wait for a moment.

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

ASSISTANT: Sorry Scott, there is no flight available on your required dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.