class_docstr: Example one person world that lets two users chat.
class_docstr_tok: ["Example","one","person","world","that","lets","two","users","chat","."]
code: def parley(self):
      for x in [0, 1]:
          a = self.agents[x].act()
          if a is not None:
              if "[DONE]" in a["text"]:
                  self.agents[x - 1].observe(
                      {
                          "id": "World",
                          "text": "The other agent has ended the chat.",
                      }
                  )
                  self.episodeDone = True
              else:
                  self.agents[x - 1].observe(a)
  
imports: from parlai.core.worlds import World
  from parlai.chat_service.services.messenger.worlds import OnboardWorld
label_desc: Use image node_id 4 for calling the MessengerChatTaskWorld obj's underlying member method code with example usage: obj.parley() without return types