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

ASSISTANT: Hello, How can I assist you?

USER: I would like to book a flight to spend free time with my parents in Atlanta to enjoy my holiday vacation. Can you please help me for booking a ticket?

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

USER: My travelling dates are 12/11 and 12/13.

ASSISTANT: May I know the source and destination details?

USER: My source is IL-ORD and destination is GA-ATL.

ASSISTANT: Please give a minute.

USER: Ok.

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

USER: Thanks for your information.

ASSISTANT: Thank you, Have a great day.