user_query: add an item
response_text: OK. Which list do you want to add to?
user_query: pcking
response_text: Alright. Which list do you want to add to?
user_query: packing
response_text: OK, I added pcking.
User: Pause my 4:30 exercise class for 15 minutes.
Parse: Pause_exercise ( duration « 15 minutes » )