user_query: shopping list
response_text: You have five things on that list.
user_query: remove cheese
response_text: You have two lists. Which one do you want to delete items from?
user_query: I want to add milk, butter and cheese to the shopping list.
response_text: Sure, I added those three things.
User: Tweet, 'Happy Birthday', actually, 'Happy Belated Birthday'.
Parse: Post_message ( medium « Tweet » message « Happy Belated Birthday » )