user: Question: Who are the Semifinalists, when the Week is May 12?
Columns: ['Tournament', 'Surface', 'Week', 'Winner', 'Finalist', 'Semifinalists']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Indian Wells', 'Hard', 'March 10', 'Lleyton Hewitt (1) 6–1, 6–1', 'Gustavo Kuerten', 'Vincent Spadea (Q) Rainer Schüttler (15)']
SQL:

assistant: SELECT "Semifinalists" FROM "Table" WHERE "Week" = 'May 12';