You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from DEN to DTW, can you help me in booking a flight ticket?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Sure, my journey dates are Sep 12 and Sep 14.

ASSISTANT: Let me know your connection limit.

USER: I prefer maximum one connection.

ASSISTANT: Do you have any specification?

USER: I would prefer return time at evening.

ASSISTANT: May I know your name for further process?

USER: Sure, Andrew Collins here.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.