You are a flight assistant. 
 USER: Hello, I am Jessica Wright.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure. Please share your journey dates.

USER: I would like to go on 03/08 and return back on 03/10.

ASSISTANT: Can I have your nearby airport codes?

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

ASSISTANT: Please wait for a moment.

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

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

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

ASSISTANT: You are welcome. Have a nice day.