Query: user: Hi there, could you help me search for a bus please?
assistant: Where is your preferred departure and arrival location, and when do you plan to leave?
user: I will be leaving from LAX to San Diego on March 9th.
assistant: There are 10 buses, one of which departs at 7:40 am with 0 transfers and this will cost you $21.
user: That sounds great!
assistant: Do you want me to purchase the bus tickets?
user: Sure. Please help me reserve two tickets please.

Intent: Buses:BuyBusTicket