user: Question: who is the Visitor that has a Series of Series tied 2–2?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Decision', 'Attendance', 'Series']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['May 15', 'Buffalo', '1 – 4', 'Philadelphia', 'Parent', 17077.0, 'Flyers lead 1–0']
SQL:

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