user_query: Add Speaker, headset and camera to my Shopping list.
response_text: Sure, I added those two things.
user_query: Remove speaker from the list.
response_text: I couldn't find speaker.
user_query: Remove headset from the list.
response_text: I couldn't find headset.
User: Cancel my ride from Albuquerque, I mean Santa Fe.
Parse: Cancel_ride ( pickup_location « Santa Fe » )