You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a flight ticket from BOS to DTW. Can you help me in that?

ASSISTANT: Sure, when are you planning to travel?

USER: My trip dates are Aug 02 to Aug 04.

ASSISTANT: Do you prefer a stopover?

USER: I need a direct flight.

ASSISTANT: In which class do you want to fly?

USER: I am ok with any class.

ASSISTANT: Do you have any specifications with the timings?

USER: My return should be in the afternoon.

ASSISTANT: May I know your good name?

USER: Myself Gregory Perez.

ASSISTANT: Thank you for your details, there are no flights found with the given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.