user_query: create a list called contact list
response_text: Alright, I made a list called "Contact List".
user_query: add alba
response_text: Got it. Alba on your list called "Contact List". Anything else?
user_query: no
response_text: OK, your list is updated.
User: Tweet that I will be on vacation this week
Parse: Post_message ( medium « Tweet » message « I will be on vacation this week » )