private boolean deleteFriendMessage(DeleteFriendMessage message, Connection sourceConnection) {
    DeleteFriendResponseMessage response;
    try {
      databaseOperations.deleteFriend(message.getSourceUsername(), message.getTargetUsername());
      response = new DeleteFriendResponseMessage(true, DELETE_SUCCESFUL);
      writeResponse(response, sourceConnection);
    }
    catch (SQLException e) {
      response = new DeleteFriendResponseMessage(false, OPERATION_FAILED);
      writeResponse(response, sourceConnection);
      return false;
    }
    return true;
  }