<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def attend_pendings(self):
 """ Check all chats created with no agent assigned yet. Schedule a timer timeout to call it. """

        chats_attended = []
        pending_chats = Chat.pending.all()
        for pending_chat in pending_chats:
            free_agent = self.strategy.free_agent() 
            if free_agent:
                pending_chat.attend_pending(free_agent, self)
                pending_chat.save()
                chats_attended.append(pending_chat)
            else:
                break
        return chats_attended