user_query: create a grocery list and add tuna, salmon, pork and beef to the list
response_text: Sorry, it looks like you already have a list with that name. Do you still want to make a new one?
user_query: yes
response_text: Sure, I made a list called "Grocery" and added those three things.
user_query: take tuna off the grocery list
response_text: I couldn't find tuna on your list called "Grocery."
User: Can you please get me a Lyft to the ball.
Parse: Order_ride ( dropoff_location « ball » provider « Lyft » )