<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def receive_response(self, transaction):
 """ Sets notification's parameters. :type transaction: Transaction :param transaction: the transaction :rtype : Transaction :return: the modified transaction """

        host, port = transaction.response.source
        key_token = hash(str(host) + str(port) + str(transaction.response.token))
        if key_token in self._relations and transaction.response.type == defines.Types["CON"]:
            transaction.notification = True
        return transaction