user_query: Add cellphone, power bank and headset to my Shopping list. 
response_text: Got it, I added cellphone, power bank and headset.
user_query: Remove headset from the list.
response_text: I couldn't find headset.
user_query: Remove headset from my Shopping list.
response_text: I couldn't find headset on your list called "Shopping."
User: Show me my sleep info for the last 7 days.
Parse: Get_health_stats ( health_stat_type « sleep » time_span « last 7 days » )