You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I need to travel from DEN to DTW, can you help me with that?

ASSISTANT: Sure, please provide me your travelling dates.

USER: My trip dates are 11/27 and 11/29.

ASSISTANT: Do you need any connection limit?

USER: Nothing. I just need a flight.

ASSISTANT: May I know your name for reservation?

USER: I am Christine Williams.

ASSISTANT: There are no flights available on your routes.

USER: That's ok, thank you for help.

ASSISTANT: Thank you for opting us.