Notify me when a task is unassigned or unaccepted

I should be notified when a cleaning (any?) task goes unassigned or unaccepted after some period of time after receiving the booking. As an owner, I should have the ability to craft custom notifications based on various criteria using check-in date, check-out date and task assignments as potential parameters. If a cleaner has not accepted a task, I should be notified so I can follow-up with them to make sure it’s on their radar. Right now, if a task is unassigned/unaccepted, I need to check the task itself. I want a push notification/email when the criteria I set is met.