Query: user: I need some bus tickets. I want to travel economy from San Diego on the 12th of this month.
assistant: What's the destination?
user: I'm going to Sacramento.
assistant: I've found a bus leaving at 7:40 am for $73. This is an economy ticket.
user: What's the name of the station it's leaving from?
assistant: That will be Santa Fe Depot.
user: What station does it stop at?
assistant: That will be Sacramento Valley Station.
user: Okay, book it. I need three tickets.

Intent: Buses:BuyBusTicket