Construct a Use Case diagram based on the below scenario description.

The Intelligent Training System (ITS) is a system that manages the registration in online training courses, where trainees request new courses and the training administrator provides data to determine the training schedule. Based on the schedule, trainees register and subsequently pay for their courses. The training administrator feeds the system with data related to the schedule and receives registration reports when registration is complete and payment receipts after payments are processed. The system updates the instructor on their course schedule and roasters. All records are maintained in the system automatically.