user_query: put makeup on the list
response_text: OK. Which list do you want to add to?
user_query: to do
response_text: Got it, I added makeup.
user_query: take it back off
response_text: Which list?
user_query: to fdo
response_text: Which list?
User: Use Stubhub, no FlipTix to buy tickets to the art show.
Parse: BuyEventTickets ( event_type « art show » provider « FlipTix » )