You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, In what way can I assist you now?

USER: Could you please book a flight ticket from DTW to SEA?

ASSISTANT: Sure, can I know your good name please?

USER: I am Kathleen Nelson.

ASSISTANT:  When you are willing to travel?

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

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any more specifications?

USER: I want to depart in the afternoon.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.