reports

Hello everyone, I'm seeking help/advice. We are trying to create a report from Reports and Data Export on assignments. We need to know how long each assignee takes to approve the assignment. We've already figured out the part about seeing the time from creation to acceptance by the user,




but we can't find the field or metadata indicating which users have not yet approved the assignment. Does anyone know how we can obtain those users who are not marked as approved or a field indicating which assignments have been approved or are still pending?