user_query: create a grocery list and add celery, tomato, buns, ketchup, mayo 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: OK, I made a list called "Grocery" and added those three things.
User: Tweet 'see you tomorrow morning'.
Parse: Post_message ( medium « Tweet » message « see you tomorrow morning » )