user_query: add barbie doll to christmas list
response_text: Got it, I added barbie doll.
user_query: actually cancel that
response_text: Are you sure you want to go ahead and delete it?
user_query: yes
response_text: OK, I deleted the list called "christmas."
User: How much is due on my Visa, I mean Mastercard bill?
Parse: Get_bill ( card_company « Mastercard » )