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

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

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

ASSISTANT: Please send your airport codes.

USER: My airport codes are ORD and IAH.

ASSISTANT: Can I have your travelling dates?

USER: I would like to go on 10/15 and return back on 10/17.

ASSISTANT: Please wait for a moment.

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

ASSISTANT: Sorry, connecting flights are available for your required dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome, thank you for reaching us.

USER: Welcome.