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For your reference:
To: Immigration Department
Immigration Tower
Wanchai
Hong Kong
Dear Sir,
This letter serves to confirm Mr. ABC has been employed by our company as a (Position) since 1 Jan 2001. Mr. ABC will be visiting to Thailand for a business trip during May but his passport has already been expired. We would appreciate if you can consider to renew a new HKSAR passport to Mr. ABC as soon as possible.
Should you have any queries, please do feel free to contact the undersigned at Tel: 1234 1234 during office hour.
Thank you very much for your kind attention.
Yours sincerely,
___________________
XYZ