I don't know the name of the contact person.

我不知道联系人的姓名。

youdao

I'm trying to write a letter to one of our clients, but I just don't know exactly what to say, and I don't know the name of the contact person.

我在给一位客户写信，但是我不知道应该说什么，而且我还不知道这位客户的名字。

youdao

Name, address, contact and person in charge of the direct selling enterprises and their branches, and name, address, contact and person in charge of the service net;

直销企业及其分支机构名称、地址、联系方式及负责人，服务网点名称、地址、联系方式及负责人；

youdao