user: Question: Who is the visitor on May 9?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Record']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['May 3', 'Detroit Red Wings', '1–4', 'Edmonton Oilers', '1–0']
SQL:

assistant: SELECT "Visitor" FROM "Table" WHERE "Date" = 'May 9';