user: Question: What is Viewers, when 18-49 is "N/A", and when Weekly Winner is "Wedding DJ Chris Dixon"?
Columns: ['Air Date', 'Rating', '18-49', 'Viewers', 'Weekly Winner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['June 27, 2008', 'TBA', '1.0/4 (#3)', '3.76 (#4)', 'Mixed Martial Artist Jeff Kelley']
SQL:

assistant: SELECT "Viewers" FROM "Table" WHERE "18-49" = 'N/A' AND "Weekly Winner" = 'Wedding DJ Chris Dixon';