user_query: No, add baseball to my sports list
response_text: What do you want to add?
user_query: Sports list
response_text: OK, I added Sports.
user_query: Sports
response_text: Alright. Which list do you want to add to?
user_query: Add item
response_text: OK. Which list do you want to add to?
User: Cancel my Lyft ride to San Francisco from Oakland, oops, I mean from San Francisco to Oakland.
Parse: Cancel_ride ( dropoff_location « Oakland » pickup_location « San Francisco » provider « Lyft » )