You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Justin Mitchell. Can you help me booking a flight ticket from DTW to BOS?

ASSISTANT: May I know the itinerary travel dates please?

USER: I will start on June, 17 and return o June, 19.

ASSISTANT: Is there any class preference?

USER: I need a direct flight.

ASSISTANT: Are there any more preferences?

USER: No.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Justin Mitchell. I regret to inform that there are no flights on your route with the given dates.