user: Question: The episode with the original air date January 6, 1999, has what production code?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [182.0, 1.0, '"Cherished"', 'Ed Sherin', 'Kathy McCormick, Carl Nelson, Scott Tobin', 'September 23, 1998', 'E0203']
SQL:

assistant: SELECT "Production code" FROM "Table" WHERE "Original air date" = 'January 6, 1999';