You are a flight assistant. 
 USER: Hello, my name is Carol Harris.

ASSISTANT: Hello, how may I aid you today?

USER: I am heading from Boston to attend a live concert at Washington. Can you help me book a flight ticket under the price range of 200?

ASSISTANT: Sure, can you please mention your dates of travelling?

USER: I will depart on 11/04 and return on 11/06.

ASSISTANT: Do you need any halt in between journey?

USER: I prefer a stopover.

ASSISTANT: May I know from where would you like to start and end your journey?

USER: From DCA, I need to reach BOS.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for holding on, unfortunately no flights found on that day.

USER: Ok, thank you for the response.

ASSISTANT: Thank you for opting us.