如何让on_reaction_add只在机器人的消息被响应时触发

import discord
from discord.ext import commands

intents = discord.Intents.default()
intents.reactions = True

bot = commands.Bot(command_prefix='!', intents=intents)

@bot.event
async def on_ready():
    print('Bot is ready.')

@bot.event
async def on_reaction_add(reaction, user):
    # 判断消息是否来自机器人
    if user.bot:
        return

    # 判断消息是否来自机器人发送的消息
    if reaction.message.author != bot.user:
        return

    # 在这里编写你想要执行的代码
    print(f'Reaction {reaction.emoji} added to bot message.')

bot.run('YOUR_BOT_TOKEN')