class_docstr: Manages interactions between agents on messenger as well as direct interactions
  between agents and the messenger overworld.
docstr: Send a message through the message manager.
  
  :param receiver_id:
      int identifier for agent to send message to
  :param text:
      string text to send
  :param quick_replies:
      list of quick replies
  :param persona_id:
      identifier of persona
docstr_tok: ["Send","a","message","through","the","message","manager",".",":","param","receiver_id",":","int","identifier","for","agent","to","send","message","to",":","param","text",":","string","text","to","send",":","param","quick_replies",":","list","of","quick","replies",":","param","persona_id",":","identifier","of","persona"]
code: def observe_message(
      self, receiver_id, text, quick_replies=None, persona_id=None
  ):
      """
      Send a message through the message manager.
  
      :param receiver_id:
          int identifier for agent to send message to
      :param text:
          string text to send
      :param quick_replies:
          list of quick replies
      :param persona_id:
          identifier of persona
      """
      return self.sender.send_fb_message(
          receiver_id,
          text,
          True,
          quick_replies=quick_replies,
          persona_id=persona_id,
      )
  
imports: import logging
  import os
  from parlai.core.agents import create_agent
  import parlai.chat_service.utils.logging
  import parlai.chat_service.utils.server
  from parlai.utils.io import PathManager
  from parlai.chat_service.services.messenger.agents import MessengerAgent
  from parlai.chat_service.core.socket import ChatServiceMessageSocket
  from parlai.chat_service.services.messenger.message_sender import MessageSender
  from parlai.chat_service.core.chat_service_manager import ChatServiceManager
label_desc: Use image node_id 18 for calling the MessengerManager obj's underlying member method code with example usage: obj.observe_message(receiver_id, text, quick_replies, persona_id) and returns: self