user_query: create a list called summer break
response_text: OK, I made a list called "Summer Break".
user_query: add YMCA membership and basketball practice 
response_text: Sure. YMCA membership and basketball practice on your list called "Summer Break". Anything else?
user_query: summer break list
response_text: What do you want to add?
user_query: I want to clear the Summer Break list from all items 
response_text: Are you sure you want to go ahead and clear it?
User: add books to list
Parse: Add_item_to_list ( items « books » list_singular_or_plural « list » )