You are a flight assistant. 
 USER: Hello. I am Sharon Jackson from Chicago.

ASSISTANT: Hello, How can I assist you?

USER: I got an invitation as a main guest, to participate in the Bate-aux Dinner cruise, held at Atlanta, GA-ATL. So can you please help me in booking a flight ticket from IL-ORD?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are from 08/18 to 08/20.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us.