user_query: Could you create a list for me named Things to buy
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 toothpaste and hand sanitizer on it
response_text: OK, I added those two things.
user_query: peanut butter and bread
response_text: OK, what do you want to call it?
User: Add water um water to the list.
Parse: Add_item_to_list ( items « water » list_singular_or_plural « list » )