user_query: Add okra, pipino and tomato to my Grocery list.
response_text: I couldn't find a list called "Grocery." Do you want me to make one?
user_query: yes
response_text: Alright, I made a list called "Grocery" and added those two things.
user_query: Delete okra from the list.
response_text: I couldn't find okra.
user_query: Delete okra from Grocery list.
response_text: I couldn't find okra on your list called "Grocery."
User: Use Fitbit to start yoga, no, pilates session.
Parse: Start_exercise ( activity « pilates » provider « Fitbit » )