We have a sheet that track onboarding activity for new clients. Two date columns in the sheet are Follow-up Due and Follow-up Actual. I would like to send a notification or reminder to the assigned employee on the Follow-up due date if the Follow-up Actual is blank so they are only receiving notifications about open items. There is no change to a row or column to initiate a notification and a reminder does not allow for an 'if' statement. Any thoughts on how to accomplish this?