user: Question: Tell me the call sign for frequency of 0 97.3 FM
Columns: ['Call sign', 'Frequency', 'City of License', 'Owner', 'Format']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['KPLU', '0 88.5 FM', 'Tacoma', 'Pacific Lutheran University', 'Public Radio / Jazz']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "Frequency" = '0 97.3 FM';