user_query: add wash do to my to-do list 
response_text: Sure, I added wash do.
user_query: display my to-do list 
response_text: You have one thing on that list.
user_query: Get my recent to-do list 
response_text: You have one thing on that list.
User: Pay my water bill for this billing no last billing cycle.
Parse: Pay_bill ( billing_cycle « last billing cycle » service_type « water » )