How can i send notifications?

How can i send notifications?

Hello Everyone, I have a form that the employees have to complete it, it's like a report for every day, and the respective people have to complete it every day with his information, so i want to notify to my boss, if someone dont do it, in an specify day, and Notify my boss every week of how many reports are complete and how many are incomplete, so, how can i do it?