user: Question: Which US air date had 4.4 million viewers?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original U.S. air date', 'Prod. code', 'Viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [50.0, 1.0, '"The Silent Treatment"', 'Phill Lewis', 'Dan Signer', 'July2,2010', 305.0, '3.4']
SQL:

assistant: SELECT "Original U.S. air date" FROM "Table" WHERE "Viewers (millions)" = '4.4';