On what dates did the student whose personal name is "Karson" 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.personal_name  =  "Karson"
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.personal_name  =  "Karson"
[{'date_of_enrolment': '2017-11-22 18:29:18', 'date_of_completion': '2018-03-09 17:56:18'}]