user_query: tell me the items on the first list
response_text: Sorry, which list do you want to know about? For example, you can say "the first one."
user_query: what are the two things on the first list?
response_text: You have eleven lists. Which one do you want to know about?
user_query: the first one
response_text: You have one thing on that list.
user_query: show me my first list
response_text: You have eleven lists. Which one do you want to know about?
User: Put milk chocolate milk on the store list.
Parse: Add_item_to_list ( items « chocolate milk » list_label « store » list_singular_or_plural « list » )