You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book flight ticket from DFW to DTW?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are Jan 18 and Jan 20.

ASSISTANT: Can I know your connection limit?

USER: I prefer a connecting flight to travel.

ASSISTANT: Do you have any class preference?

USER: No, thank you for asking.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Please check with return time in the afternoon.

ASSISTANT: May I know your name, please?

USER: Linda Collins here.

ASSISTANT: Sorry to say, there are no flights in the afternoon.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.