user: Question: Which Road team has a Home team of Portland, and a Date of May 31?
Columns: ['Game', 'Date', 'Home team', 'Result', 'Road team']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Game 1', 'May 22', 'Philadelphia', '107–101', 'Portland']
SQL:

assistant: SELECT "Road team" FROM "Table" WHERE "Home team" = 'Portland' AND "Date" = 'May 31';