user_query: create a vocation list
response_text: Got it, I made a list called "Vocation".
user_query: add beach
response_text: Sure. Beach on your list called "Vocation". Anything else?
user_query: add library
response_text: Got it. Library. Anything else?
user_query: Clear my vocation list completely.
response_text: What do you want to add?
User: Add a 1 hour belly belly dancing class.
Parse: Log_exercise ( activity « belly dancing » duration « 1 hour » )