帮Mandy用英文编写信件告知Nina邮寄单号为RC958974495CN邮寄状态为已经到达北京望京国际交换局。预计三天内到达

Dear Nina,

I hope this letter finds you well. I am writing to inform you that the tracking number for your package is RC958974495CN, and the current status is that it has arrived at the Beijing Wangjing International Exchange Bureau. It is expected to be delivered within the next three days.

Please let me know if you have any further questions or concerns. Thank you for your patience and understanding.

Best regards,

Mandy