急!!临时加了个人，有什么办法让酒店同意在不加

如题，在agoda预订了普吉岛卡伦海滩Centara Grand Beach Resort Phuket酒店，订了双人豪华房，由于临时加了个人，给酒店发邮件想让酒店同意在不加床的情况下免费加一个人。
酒店的回复是这样的：

Greeting from Centara Grand Beach Resort Phuket

There will be additional adult charge even extra bed not require at 2,120 THB net per adult per day. Please advise if this offer could be acceptable.

Should there be further information or assistance you may require please do not hesitate to contact us.

Best regards,
本身订的就觉得比较贵，现在多加500左右一晚太贵了。不能接受，有什么办法能让酒店同意免费加人？？？求帮忙，谢谢各位了。