user: Question: Name the original air date for 15.74 viewers
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [79.0, 1.0, '" Dream a Little Dream of Me (Part 1) "', 'Rob Corn', 'Shonda Rhimes', 'September25,2008', '18.29']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "U.S. viewers (millions)" = '15.74';