user: Question: Which Role has a First US National Tour of Roger Bart?
Columns: ['Role', 'Original Broadway production', 'First US National Tour', 'Second US National Tour', 'Original Italian production']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Dr. Frederick Frankenstein', 'Roger Bart', 'Roger Bart', 'A.J. Holmes', 'Giampiero Ingrassia']
SQL:

assistant: SELECT "Role" FROM "Table" WHERE "First US National Tour" = 'Roger Bart';