docstr: Generate response to last seen observation.
docstr_tok: ["Generate","response","to","last","seen","observation","."]
code: def act(self):
      """
      Generate response to last seen observation.
      """
      resp = self.query_chat_completion_api()
      resp_txt = resp["choices"][0]["message"]["content"]
  
      msg = {"role": self.role, "content": resp_txt}
      if self.name:
          msg["name"] = self.name
      self.turns.append(msg)
  
      return Message(
          {"id": self.getID(), "text": resp_txt, "episode_done": False}
      )
  
file_path: ParlAI/parlai/agents/openai_chat_completions/openai_chat_completions.py
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.agents import Agent
  from parlai.core.message import Message
label_desc: Use image node_id 5 for calling the OpenaiChatCompletionsAgent obj's underlying member method code with example usage: obj.act() and returns: Message