user: Question: Who was the visiting team on May 7?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Record']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['May 1', 'Pittsburgh Penguins', '3–6', 'Boston Bruins', '1–0']
SQL:

assistant: SELECT "Visitor" FROM "Table" WHERE "Date" = 'May 7';