user_query: Check off exercise from that list
response_text: Which list?
user_query: yeah
response_text: Alright, I made a list called "Must Do" and added those two things.
user_query: Add exercise and yoga in Must Do list
response_text: I couldn't find a list called "Must Do." Do you want me to make one?
User: Make an addition to the grocery list
Parse: Add_item_to_list ( list_label « grocery » list_singular_or_plural « list » )