code: async def delete_conversation(self, delete_conversation_request):
          
          response = hangouts_pb2.DeleteConversationResponse()
          await self._pb_request('conversations/deleteconversation',
                                 delete_conversation_request, response)
          return response
docs: Leave a one-to-one conversation.
  
          One-to-one conversations are "sticky"; they can't actually be deleted.
          This API clears the event history of the specified conversation up to
          ``delete_upper_bound_timestamp``, hiding it if no events remain.