On what dates did the student with family name "Zieme" and personal name "Bernie" enroll in and complete the courses?
SELECT T1.date_of_enrolment ,  T1.date_of_completion FROM Student_Course_Enrolment AS T1 JOIN Students AS T2 ON T1.student_id  =  T2.student_id WHERE T2.family_name  =  "Zieme" AND T2.personal_name  =  "Bernie"
Aile adı "Zieme" ve Kişisel Adı "Bernie" olan öğrencinin hangi tarihlerde kursları tamamladığı ve tamamladık?