Just to remind that we still did not receive the supporting document to settle the advance money. On June xxx, 2007, we advance you $xxx for purchasing xxxx (幫公司做什麼野).
This is to remind you that this department had paid HK$500.00 to xxx on your behalf on 1st May 07. Kindly let us have an authorized reimbursment slip at your earliest convenience.
Thank you for your attention & cooperation regarding this matter.