user_query: Can you add a tent to my Camping Supplies list?
response_text: I couldn't find a list called "Camping Supplies." Do you want me to make one?
user_query: Of course.
response_text: Got it, I made a list called "Camping Supplies" and added a tent.
User: Instead of a tent, add sleeping bag.
Parse: Add_item_to_list ( items « sleeping bag » )