user_query: create a list called flower list
response_text: Sure, I made a list called "Flower List".
user_query: add carnation
response_text: Got it. Carnation on your list called "Flower List". Anything else?
user_query: add sunflower
response_text: Got it. Sunflower. Anything else?
user_query: no
response_text: OK, your list is updated.
User: Get coffee from Walmart, no, from Safeway.
Parse: Get_product ( product « coffee » product_source « Safeway » )