You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to attend a Marriage in Boston. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, let me know your trip dates please?

USER: My travelling dates are Nov 10 and Nov 12.

ASSISTANT: Could you please share me your source airport code?

USER: My airport codes are IAD and BOS.

ASSISTANT: May I know your connection limit?

USER: I would prefer single connecting flight.

ASSISTANT: Do you have any time concern?

USER: No, I don't have any other preferences.

ASSISTANT: Can I know your name please?

USER: My name is Joshua Collins.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Anyway, thanks for the information.

ASSISTANT: Thanks for reaching us, have a nice day.