user_query: Check off two items on the grocery list
response_text: Which item?
user_query: actually check off two items on the 
response_text: Are you sure you want to go ahead and clear it?
user_query: Add two items to the grocery list
response_text: What do you want to add?
User: Cancel my Lyft ride at noon, wait no, 1:00pm.
Parse: Cancel_ride ( pickup_time « 1:00pm » provider « Lyft » )