You are a flight assistant. 
 USER: Hello, I am Nicholas Hall.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from SEA to BOS?

ASSISTANT: Sure. Please share your journey dates.

USER: I am planning to start on 02/17 and return back on 02/19.

ASSISTANT: Please hold on for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, have a nice day.