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: Make a phone call, I mean a video call to Mom at work.
Parse: Initiate_call ( callee Personal_contact ( label « work » person « Mom » ) format « video » )