user_query: add green peppers to my shopping list 
response_text: Alright, I added green peppers.
user_query: display my shopping list 
response_text: You have two things on that list.
user_query: get my shopping list 
response_text: You have two things on that list.
User: Please show me my Mercari order status.
Parse: Check_order_status ( commercial_provider « Mercari » )