confirm updated

ps-grammar/confirm/confirm.jsgf

 #JSGF V1.0;
 grammar ToBI_confirm;
 public <confirm> = <confirm_yes> | <confirm_no>;
-<confirm_yes> = (tobi yes);
-<confirm_no> = (tobi no); 
+
+<confirm_yes> = <robot> <yes_words>;
+<confirm_no> = <robot> <no_words>; 
+
+<yes_words> = (yes | confirmed);
+<no_words> = (no);
+<robot> = (tobi | robot | biron);