You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid  you today from my end?

USER: I need you to book flight ticket from Chicago. Please help me.

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: March 3 and 5 are my fixed travelling dates.

ASSISTANT: May I know your location airport codes?

USER: ORD and DTW are the respective in and out airport codes.

ASSISTANT: Do you have connection limit?

USER: I would prefer to take rest in between journey. So check for a connecting flight.

ASSISTANT: May I know your name to proceed further?

USER: My name is Helen Jones.

ASSISTANT: Sorry Helen Jones, there is no flight in your route as per your request.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.