user_query: add buy football to sports list
response_text: Alright, I added buy football.
user_query: actually add football to balls list instead
response_text: I couldn't find a list called "Balls."
user_query: create balls list
response_text: OK, I made a list called "Balls".
user_query: add football to that list
response_text: OK. Football on your list called "Balls". Anything else?
User: I need a ride home in ten minutes.
Parse: Order_ride ( dropoff_location « home » pickup_time « in ten minutes » )