Pending Expense Reports

We have situations where employees start an expense report and either think it was submitted for approval, but it goes to pending because there are errors on their report that they didn't notice when they submitted the report and got returned to the detail page OR they couldn't find the report they originally started and saved so they created a new one.

In this case, is there anyway to notify these people that they have a pending expense report after so many days similar to how you can notify approvers they have an expense report needing approval after a set number of days?