How to get notification to admin when user have not completed task on a time?

Hello Erpnext team,
I want to design system with following feature:

I am admin i will assign task to user with completion date. I should get the notification or email which all user have completed task on a time and all users those who have not completed till yet.
(and task can be like fill your details in doctype).

Your help will be appreciated.

Have you tried Email Alert:

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