user_query: add barbie doll to christmas list
response_text: Got it, I added barbie doll.
user_query: change that. Add barbie doll to birthday list instead 
response_text: Got it, I changed the list title to "Barbie Doll To Birthday."
user_query: birthday
response_text: Here are some results from a search
user_query: create a birthday list
response_text: Alright, I made a list called "Birthday".
User: I don't need the Uber ride home, I mean to school anymore.
Parse: Cancel_ride ( dropoff_location « school » provider « Uber » )