user_query: create a list for favorite songs
response_text: Alright, I made a list called "Favorite Songs".
user_query: add happy birthday
response_text: OK. Happy birthday on your list called "Favorite Songs". Anything else?
user_query: clear favorite songs
response_text: What do you want to add?
User: Order 2 pepperoni pizzas, uh medium pizzas, no, actually individual sized please.
Parse: Order_menu_item ( menu_item « pepperoni pizzas » quantity MenuItemQuantity ( amount « 2 » ) )