How to render "N/A" in fields with empty dates in an existing nested IIF/Is nothing function

I have an existing IIF/Is Nothing function in place and want the field to show N/A is there is no dates in my expression:

IIF(IsNothing(Fields!ActualPR.Value),Fields!ScheduledPR.Value,Fields!ActualPR.Value)

Is it possible to have it show NA is there is no dates flagged for either Actual or Schedule?