You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please help me in booking a flight ticket in my preferable travel dates Nov, 21 and Nov, 23.

ASSISTANT: Sure, I am here to help you out. May I know your airport codes please?

USER: DTW and DFW are my airport codes.

ASSISTANT: Can you please share your connection limit?

USER: I would prefer single connection.

ASSISTANT: Is there any other specifications?

USER: No, thanks.

ASSISTANT: May I know your name please?

USER: Lisa Thompson here.

ASSISTANT: Lisa Thompson, there are no flights available in your route with your specifications.

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

ASSISTANT: Thank you for choosing us.