user: Question: What is the highes win % that manager juan carlos chávez's team had when they lost less than 4 times?
Columns: ['Manager', 'Mexico career', 'Played', 'Drawn', 'Lost', 'Win %']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['Horacio Casarin', '1977', 5.0, 4.0, 0.0, 20.0]
SQL:

assistant: SELECT MAX("Win %") FROM "Table" WHERE "Manager" = 'juan carlos chávez' AND "Lost" < 4.0;