Compose an email to a customer apologizing for the delayed shipment and provide a potential solution.
user
Dear Customer,

We apologize for the delayed shipment of your order. We understand how important it is for you to get your items on time and we apologize for any inconvenience this may have caused. To make up for any inconvenience caused, we would like to offer you a 20% discount on your next purchase.

Thank you for your understanding,
<Your Company Name>
assistant