user_query: Take medicine.
response_text: Alright, I'll remind you on Wednesday at 8:00 PM.
user_query: 8 pm.
response_text: OK, on Wednesday at 8:00 PM. What's the reminder?
user_query: Do remind me tomorrow.
response_text: Got it, on Wednesday. At what time?
User: Log a 1 hour Zumba class.
Parse: Log_exercise ( activity « Zumba » duration « 1 hour » )