user_query: Add milk and eggs to a new list
response_text: Got it, what do you want to call it?
user_query: paulty
response_text: Alright, I made a list called "Poultry" and added those two things.
user_query: paper
response_text: What do you want to add?
user_query: paper
response_text: Got it. Paper on your list called "Poultry". Anything else?
user_query: no
response_text: OK, your list is updated.
User: Conocer la last week's energy bill.
Parse: Get_bill ( account_type « energy » billing_date_span « last week's » )