You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Alexander Lee. I would like to attend my friend wedding at Boston, can you please help me to book a flight ticket from SEA to BOS?

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, my trip dates are Aug 19 and Aug 21.

ASSISTANT: Do you have any preferences?

USER: My departing time is afternoon.

ASSISTANT: Do you need any connecting flight in between your journey?

USER: I need a connecting flight.

ASSISTANT: Give me a minute. Sorry, there is no flight on your given dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.