You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to attend a Seminar in Chicago. Can you please help me for booking the flight ticket?

ASSISTANT: May I know your nearest airport codes?

USER: My airport codes are DFW and ORD.

ASSISTANT: Can you please share your travel dates?

USER: My travelling dates are May 28 and May 30.

ASSISTANT: Do you have any connecting limit preferences?

USER: I prefer single connecting flight.

ASSISTANT: May I know your name please?

USER: Gregory Adams.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: No flights found as per your preferences in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.