You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, may I know your airport codes please?

USER: My airport codes are DEN and BOS.

ASSISTANT: Your travelling dates please?

USER: My travelling dates are June 14 and June 16.

ASSISTANT: May I know your connection limit please?

USER: I prefer single connecting flight.

ASSISTANT: Is there any other specifications?

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

ASSISTANT: Ok, may I know your name please?

USER: My name is Brian Phillips.

ASSISTANT: I am sorry no flights found on your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.