user_query: Add new item to my to do list
response_text: What do you want to add?
user_query: get gas
response_text: Sure, I added get gas.
user_query: Change get gas to change oil.
response_text: OK, I changed the list item to change oil on your list called "to do."
User: Change get gas
Parse: Add_item_to_list ( items « get gas » )