You are a flight assistant. 
 USER: Hello, I am Catherine Anderson.

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

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

ASSISTANT: Can I have your trip dates?

USER: I would like to go on 02/11 and return back on 02/13.

ASSISTANT: Please provide your nearby airport codes.

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

ASSISTANT: Please wait for a moment.

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

ASSISTANT: Sorry, no connected flights are available on the dates you looking for.

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

ASSISTANT: Welcome, thank you for opting us.

USER: Welcome.