How to use automated actions on odoo 11 CE for sending emails to all and specific employees?? I setup an action for all employees but couldnt build the logic for specific people. below is the scenario why i want to use it.

I want to use automated actions to sending emails. first general reminder for all employess on 02:30pm to fill timesheet then second reminder to specific people who didnt fill on 5pm. then a final reminder to those again who didnt fill at 6pm