Hello how may I help you? I need some help with navigation Okay how can I help you? Right now I'm at the corner of Main St and South St. What's the closest subway station to me? The closest subway station is at the end of South Street near the news stand Ok. What lines does that station have access to? The station has access to the grey, red, and blue lines That's perfect, I need to take the blue line. When's the next blue line train? The next blue line train leaves in 15 minutes Great, thanks for all the help! You are welcome