I need help on this part. I can't do it right

1) Draw a dataflow diagram for the university course registration system: . The student selects courses from the list of available courses The student submits the list of courses to their advisor for approval . The advisor may ask the student to make changes The advisor approves the student's course schedule o If the student is a Sophomore, Junior or Senior, the advisor activates the self-registration system o If the student is a Freshman, the advisor registers the student in the registration system .Sophomore, Junior and Senior students register themselves in the registration system . Changes may be needed if courses are filled at the time of registration