How to write a reminder letter for the renewal of the labor contract?

Is it issued to employees by the unit? It is suggested to write the following main contents: * * * The labor contract you signed with the company will expire on * * * *, please renew it in the human resources department of the company before * * * * *; If you don't renew the fee when it expires, it will be regarded as giving up the renewal fee, and you will be responsible for all the problems caused by it.