user: Question: Where's the school that Mark Fletcher is the principal of?
Columns: ['School', 'City / Town', 'Website', 'Size', 'Principal', 'Grades', 'IDOE Profile']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Aurora Alternative High School', 'Bloomington', 'Website', 80.0, 'Charles Holloway', '09-12', 'Snapshot']
SQL:

assistant: SELECT "City / Town" FROM "Table" WHERE "Principal" = 'Mark Fletcher';