user: Question: What is Visitor, when Date is "May 9"?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Record']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['May 4', 'Montreal Canadiens', '1–2', 'Chicago Black Hawks', '1-0']
SQL:

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