Using rules to disable flag access

Hi everyone. I'm a beginner on drupal and I'm building a site with booking management with rules and flag module. I met problems when implementing booking function，which disables flagging to user roles on specific node(content type) when exceeding limitation. Actually I have two plans, one is to hide the flag link, the other is to remove flag access on node with user roles, but I can't make either with actions provided by rules. Any suggestions? Of course not to implement the hook_flag_access() :(.