user_query: onion, chili
response_text: OK, I added onion, chili.
user_query: Groceries
response_text: What do you want to add?
user_query: Please include some items on my initial list.
response_text: Alright. Which list do you want to add to?
User: I need to buy 3 I mean 4 tickets to the Raptors game on Friday.
Parse: BuyEventTickets ( event_performer « Raptors » event_time « Friday » ticket_quantity « 4 » )