请根据以下要点帮Mandy用英文拒绝Nina的纠纷。不退款不退货；共同协商解决；寄递延误耐心等待；如寄递失败会提供退款或重寄

Dear Nina,

Thank you for your message regarding the recent dispute. However, I am unable to comply with your request for a refund or return at this time.

I would like to suggest that we work together to find a mutually satisfactory solution to the issue at hand. In the meantime, please be patient as there may be delays in shipping due to unforeseen circumstances.

If for any reason the shipment is unsuccessful, I will be more than happy to offer a refund or a replacement.

Thank you for your understanding and cooperation in this matter.

Best regards,

Mandy