user: Question: what is the outcome when the surface is Grass on 23 June 1997?
Columns: ['Outcome', 'Date', 'Championship', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '8 April 1991', 'Hong Kong, UK', 'Hard', 'Wally Masur', '6–2, 3–6, 6–3']
SQL:

assistant: SELECT "Outcome" FROM "Table" WHERE "Surface" = 'Grass' AND "Date" = '23 June 1997';