user_query: show my tasks
response_text: You have eight reminders. Here are three: today at noon, "Pay bills" Every day at 10:00 AM, "Take medicine." Wednesday at 8:00 AM, "get up early". Do you want to hear more?
User: I no longer need to go to the dentist office at 7pm, I meant at 8pm.
Parse: Cancel_ride ( dropoff_location « dentist office » pickup_time « 8pm » )