user_query: create a shopping 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: add eggplant
response_text: Got it, what do you want to call it?
user_query: egg
response_text: Sure, I made a list called "Egg" and added eggplant.
user_query: no
response_text: No problem, nothing's been changed.
User: I want to see the supermarket list on my iPhone
Parse: Get_list ( device « my iPhone » list_label « supermarket » list_singular_or_plural « list » )