user_query: add roast beef to store list 
response_text: Got it, I added roast beef.
user_query: add roast beef 
response_text: Alright, I added roast beef.
user_query: Display my store list 
response_text: You have two things on that list.
User: Get me Downtown in a Uber ride.
Parse: Order_ride ( pickup_location « Downtown » provider « Uber » )