You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for the day?

USER: I am Patrick Carter. I am planning to travel from DCA to BOS, help me in booking a flight?

ASSISTANT: Sure, I am here to help you with that. Can you please share your preferable travel dates?

USER: My travelling dates are Sept 03 to 05.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I want to return in afternoon flight.

ASSISTANT: May I know your connection limit?

USER: I need direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: There are no flights found on this route as per your travel dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have  a great day.