You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am Anthony Davis, I want book reserve a ticket from Detroit  to Chicago.

ASSISTANT: Sure, could you please provide your travelling details?

USER: Yes, my depart day is on Sept 30 and return day is on Oct 2.

ASSISTANT: May I know airport codes?

USER: And my origin airport is MI - DTW and destination airport is IL - ORD.

ASSISTANT: Sorry, there is no flights found based on your details.

USER: OK, no problem.

ASSISTANT: Thank you, have a nice day.

USER: Thank you.