user: Question: when did 14.55 people watch?
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: [46.0, 1.0, '"Doubt"', 'Gloria Muzio', 'Chris Mundy', 'September26,2007', '12.66']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "U.S. viewers (millions)" = '14.55';