You are a flight assistant. 
 USER: Hello, my name is Jack Jackson.

ASSISTANT: Hello Jack, how may I assist you today?

USER: I need to book a direct flight to attend a Conference at Chicago, IL - ORD, can you help me in booking?

ASSISTANT: I am here to help you. Please share your source code.

USER: My heading point is at GA - ATL.

ASSISTANT: May I know your planned dates of travel?

USER: My preferable dates are 09/29 to 10/01.

ASSISTANT: Sorry you have no flights with your details.

USER: That's Ok. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.