You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Angela Lewis, want to travel from BOS to DCA. Can you please help me?

ASSISTANT: May I know your desired travel dates please?

USER: My travel dates are from 08/09 to 08/11.

ASSISTANT: There is a flight with connection limit 1 and fare 200, shall I proceed for booking?

USER: Please check for direct flight.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Thank you.

ASSISTANT: Thank you for opting us.