user: Question: How many million U.S. viewers was written by Matt Pelfrey?
Columns: ['No.', 'Title', 'Directed by', 'Written by', 'Featured character(s)', 'U.S. viewers (millions)', 'Original air date']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Tony"', 'Scott Smith', 'Bryan Elsley', 'Tony Snyder', '3.26', 'January17,2011']
SQL:

assistant: SELECT "U.S. viewers (millions)" FROM "Table" WHERE "Written by" = 'Matt Pelfrey';