请帮忙提供一个英文的保函，要比较正式的公文格式，英文的，谢谢：

注：此保函以来访人公司名义发出

To: XX
From: 公司名称
Date: 日期
Dear Sir or Madam,
XX is [职位position] of our company. He himself (or She herself) will cover all the expenses (include living, travelling, insurance expenses) in China.
We guarantee that he (or she) would obey all the Chinese laws and regulations and leave China on time. If there are voilations, you shall be entitled to pursue our company's liability for damages caused by the voilations.
Name Sex Position Date of Birth Passport Number 需要写明来访人个人信息
[ ] [M/F] [ ] [ ] [ ]

Yours sincerely,
Signature of the legal representative （法人代表签名）
Company Seal （公司盖章）