user: Question: Name the timeslot for 6.51 viewers
Columns: ['#', 'Episode', 'UK air date', 'Timeslot', 'Viewers (millions)', 'Audience share in timeslot']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Let\'s Dance"', '26 October 2008', '6:15 pm', '6.55', '14.5%']
SQL:

assistant: SELECT "Timeslot" FROM "Table" WHERE "Viewers (millions)" = '6.51';