How to prevent record deletion based on certain condition?

Below code can help you.

trigger deleteContact on Contact(before delete) {
 Id profileId = userinfo.getProfileId();
 String profileName = [Select Id from Profile where Id =: profileId].Name;
 //if you are using Status field as picklist then write con.Status__c == 'Active'.
 //if you are using Status field as checkbox then write con.Status.
 for (Contact con: trigger.old) {
  if (profileName == 'Sales' && con.Status__c) {
   if (Trigger.isBefore) {
    if (Trigger.isDelete) {
     con.adderror('You cannot delete the record');
    }
   }
  }
 }
}

Let me know if you have any confusion..