user_query: create a shopping list name party
response_text: Sure, I made a list called "Party".
user_query: add drinks, candle and plates
response_text: Sure. Drinks, candle and plates on your list called "Party". Anything else?
user_query: party list
response_text: What do you want to add?
User: I need tickets for an event at the Convention Center.
Parse: BuyEventTickets ( event_location « Convention Center » )