user: Question: What date did the episode with 8.28 million u.s. viewers originally air?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '" Pilot "', 'Andy Ackerman', 'Kari Lizer', 'March13,2006', '12.36']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "U.S. viewers (millions)" = '8.28';