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: Can I see my water consumption last weekend?
Parse: Get_health_stats ( health_stat_type « water consumption » time_span « last weekend » )