user_query: Cheese
response_text: Alright, I checked off cheese.
user_query: Mark grocery list as complete
response_text: Which item?
user_query: Tell me what's on my grocery list.
response_text: You have three things on that list. They're eggs, pasta, cheese.
User: I need to resume my run, I mean yoga.
Parse: Resume_exercise ( activity « yoga » )