user_query: Add coffee to shopping list 
response_text: Alright, I added coffee.
user_query: Get coffee from store 
response_text: Sorry, I looked for Coffee From Store, but couldn't find it. Do you want to see all of your lists?
user_query: Display list called shopping 
response_text: You have three things on that list.
user_query: Add cheese and grapes to list called shopping 
response_text: Alright, I added cheese and grapes.
User: get me the coffee
Parse: Get_product ( product « coffee » )