user: Question: Which city had the Charleston Area Convention Center as its callback location
Columns: ['Episode Air Date', 'Audition City', 'Date', 'First Audition Venue', 'Callback Date', 'Callback Venue', 'Golden Tickets']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['January 15, 2008', 'Philadelphia, Pennsylvania', 'August 27, 2007', 'Wachovia Center', 'September 1–2, 2007', 'Hyatt Regency', 29.0]
SQL:

assistant: SELECT "Audition City" FROM "Table" WHERE "Callback Venue" = 'Charleston Area Convention Center';