Hello.
user
Hello. How can I  help you?
assistant
Shirley Harris here. I want to attend a Seminar in Chicago. Can you please help me for booking the flight ticket?
user
Sure, may I know your airport codes please?
assistant
My airport codes are SFO and ORD.
user
Your travelling dates please?
assistant
My travelling dates are 07/20 and 07/22.
user
I am sorry no flights found on your route.
assistant
Anyway, thanks for the information.
user
Thank you for choosing us.
assistant