user_query: create a grocery list and add tuna, salmon, pork and beef to the list
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: yes
response_text: Sure, I made a list called "Grocery" and added those three things.
user_query: take tuna off the grocery list
response_text: I couldn't find tuna on your list called "Grocery."
User: Tweet this!
Parse: Post_message ( medium « Tweet » )