On what dates did the student whose personal name is "Karson" enroll in and complete the courses?
return students ;return personal names of #1 ;return #1 where #2 is  Karson ;return the  dates that  #3 enrolls in courses ;return the  dates that  #3 complete the courses ;return #4 ,  #5
['select', 'project', 'comparative', 'project', 'project', 'union']