You are a flight assistant. 
 USER: Hello, I am Robert Thomas.

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

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

ASSISTANT: Please share your travelling dates?

USER: I would like to go on 04/23 and return back on 04/25.

ASSISTANT: May I know your source and destination airport codes?

USER: My airport codes are HOU and HOU.

ASSISTANT: Please wait for a while.

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

ASSISTANT: Delta airlines is providing 1 flight with 1 connection. Shall I proceed?

USER: Ok, please proceed if it costs you below 200.

ASSISTANT: Your ticket is confirmed with flight number 1006. Happy journey.

USER: Thank you.

ASSISTANT: You are welcome. Thank you for availing our services.

USER: Welcome.