user: Question: What is the title when u.s. viewers (millions) is 3.97?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (in millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [13.0, 1.0, '"Gilted Lily"', 'Stephen Hopkins', 'David Maples', 'April19,2009', '5.11']
SQL:

assistant: SELECT "Title" FROM "Table" WHERE "U.S. viewers (in millions)" = '3.97';