You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Would you do me a favour in making my reservation from DTW to ORD?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: Sure, my planned travelling dates are from 09/20 to 09/22.

ASSISTANT: May I know your name to proceed further?

USER: My name is Paul Collins.

ASSISTANT: Thank you for the details. Paul, I am sorry to inform you that there is no flight available at your request.

USER: It's ok, thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.