user_query: playoff tree add to list
response_text: Got it. Which list do you want to add to?
user_query: put eggs on list
response_text: OK. Which list do you want to add to?
user_query: don't add
response_text: OK
User: My 30 minute lunchtime walk needs to be manually added to MyFitnessPal.
Parse: Log_exercise ( activity « walk » duration « 30 minute » provider « MyFitnessPal » time « lunchtime » )