user: Question: What is the lowest facility ID that's in Beckley?
Columns: ['Call sign', 'Frequency', 'City of license', 'Facility ID', 'ERP / Power W', 'Height m ( ft )', 'Class', 'FCC info']
Types: ['text', 'text', 'text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['WAUA', '89.5 FM', 'Petersburg', 71659.0, 10000.0, 'm (ft)', 'B', 'FCC']
SQL:

assistant: SELECT MIN("Facility ID") FROM "Table" WHERE "City of license" = 'Beckley';