<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def handle_call(self, body, message):
 """Handle call message."""

        try:
            r = self._DISPATCH(body, ticket=message.properties['reply_to'])
        except self.Next:
            # don't reply, delegate to other agents.
            pass
        else:
            self.reply(message, r)