user: Question: Which Visitor has a Series of 2 – 1?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Decision', 'Series']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['April 7', 'Calgary', '3 - 5', 'Vancouver', 'Cloutier', '1 – 0']
SQL:

assistant: SELECT "Visitor" FROM "Table" WHERE "Series" = '2 – 1';