user_query: Begin a new list with lemons, limes, sugar, water
response_text: Alright, what do you want to call it?
user_query: Lemon limeade recipe
response_text: Alright, I made a list called "Lemon Limeade Recipe" and added those four things.
user_query: Cancel the list that has lemons
response_text: OK, I deleted lemons.
user_query: delete the list that has limes and sugar
response_text: Sure, I deleted limes.
User: add coffee to walmart list
Parse: Add_item_to_list ( items « coffee » list_label « walmart » list_singular_or_plural « list » )