user: Question: What episode number in the series had 2.77 million U.S. viewers?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'U.S. viewers (million)', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [47.0, 1.0, '"Wanted"', 'Paul Holahan', 'Jeff Eastin', '3.21', 'July10,2012', 'BCW401']
SQL:

assistant: SELECT "No. in series" FROM "Table" WHERE "U.S. viewers (million)" = '2.77';