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dear sir / madam,
your order has been shipped since monday. but we feel so sorry to inform you of a possible delay because of peak seasons or bad weather.
we will keep a close eye on your order, and let you know as soon as possible if there is anything new. in order to make up for the possible inconvenience, we will offer you a/an xx dollar coupon, which can be used in your next order with us. your kind understanding will be greatly appreciated.
if there is anything we can do for you, do not hesitate to contact us. thank you.
best regards!
(your name)
参考译文：
亲爱的先生/女士：
您的订单已于周一发货。但我们要通知您，由于旺季或者恶劣天气的原因，运输可能会延误，我们对此深表遗憾。
我们将密切关注运输状态，一旦有新消息便会尽快告诉您。为了弥补可能给您带来的不便，我们将为您提供一张xx美元的优惠券，您下次在本店购物时可以使用。衷心感谢您的善解人意。
如果有任何我们能为您做的事，请随时联系我们。感谢您的惠顾。
祝好!
(你的名字)