user_query: create a shopping list
response_text: Sorry, it looks like you already have a list with that name. Do you still want to make a new one?
user_query: add eggplant
response_text: Got it, what do you want to call it?
user_query: egg
response_text: Sure, I made a list called "Egg" and added eggplant.
user_query: no
response_text: No problem, nothing's been changed.
User: Pay my utilities bill with the AMEX, actually Visa.
Parse: Pay_bill ( card_company « Visa » service_type « utilities » )