When you are served with Legal Separation papers, you should get legal advice as to what to do. Normally, you would file a response because there are issues that need to be addressed. In the instance that you are served with Legal Separation papers, but you want to Divorce instead, then that would be stated in the Response. In this case, you would now be dealing with Divorce and not Legal Separation. Your attorney can advise you as to your best options.