user_query: Attend music class.
response_text: Sure, I'll remind you on Tuesday at 4:00 PM.
user_query: Add a reminder on October 31st and November 1st at 4 pm.
response_text: Got it, on Tuesday at 4:00 PM. What's the reminder?
User: Use my Fitbit to track my run, I mean walk.
Parse: Start_exercise ( activity « walk » provider « Fitbit » )