user_query: add buy football to sports list
response_text: Alright, I added buy football.
user_query: actually add football to balls list instead
response_text: I couldn't find a list called "Balls."
user_query: create balls list
response_text: OK, I made a list called "Balls".
user_query: add football to that list
response_text: OK. Football on your list called "Balls". Anything else?
User: How's my Verizon I mean AT&T bill for last month?
Parse: Get_bill ( account_provider « AT&T » billing_date_span « last month » )