You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Andrew Campbell. I want to visit a Grant Park in Chicago, so please book a flight ticket from Minneapolis & St, Paul, MN - MSP.

ASSISTANT: Sure. May I know your journey dates?

USER: My departure day is 02/12, return day is 02/14.

ASSISTANT: Let me know your source code?

USER: Already mentioned above.

ASSISTANT: Let me know your destination code?

USER: My destination airport code is IL - ORD.

ASSISTANT: There is no flights available with your data.

USER: No problem, thanks for your help.

ASSISTANT: Thank you.