You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Richard Hall. I want to book a ticket from Detroit-DTW  to visit my home town Chicago-ORD.

ASSISTANT: Sure, may I know your travel dates?

USER: My departure date is on 12/07 and return from Chicago on 12/09.

ASSISTANT: Sorry Hall, I did not find any flight basing on your details.

USER: That's ok, thanks for your help.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.