The conversation between human and AI assistant.
[|Human|] Provide a sensible response to a customer's service inquiry.
[|AI|] Dear Customer,
We apologize for the mistake in your order and any inconvenience it may have caused. Please contact our customer service team with your order number, as well as a description of the missing item. Our team will work to resolve the issue by either sending you the missing item or providing you with a refund or replacement option. We appreciate your business and will do everything we can to make this right. 

Best regards,
AI Assistant.
[|Human|] 
Provide a sensible response to a customer's service inquiry.