user_query: Set a reminder call swimming change it to driving
response_text: OK, call swimming. When do you want to be reminded?
user_query: on monday no friday
response_text: When do you want it to repeat?
user_query: 8pm no 10pm
response_text: When do you want it to repeat?
User: What is the amount of the my water bill from last month?
Parse: Get_bill ( account_type « water » billing_date_span « last month » )