user_query: add item to Camping list
response_text: What do you want to add?
user_query: soda
response_text: I couldn't find a list called "Camping." Do you want me to make one?
user_query: actually add soda to shopping list instead
response_text: You have two items on that list. Which one do you want to edit?
User: add soda
Parse: Add_item_to_list ( items « soda » )