user_query: I mean, delete pets from my to do list
response_text: I couldn't find pets on your list called "To Do."
user_query: show me my to do list
response_text: You have one thing on that list.
User: I mean, add pets to my to do list
Parse: Add_item_to_list ( items « pets » list_label « to do » list_singular_or_plural « list » )