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_query: Remove power bank from my Shopping list.
response_text: I couldn't find power bank on your list called "Shopping."
User: Track my jog on, uh, on my Fitbit.
Parse: Start_exercise ( activity « jog » provider « Fitbit » )