Hi happyhour, I would have added "your" after "Refer to". Since it is a formal letter, you should write "you have informed us" instead of "told us" and "in the first or second week of " instead of "in 1st or 2nd week of". This is my correction.
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happyhour123Dear ***,
Refer to previous email , you’ve told us that you can commence your audit fieldwork in 1st or 2nd week of July. And this is to remind you again that Annual General Meeting (AGM) of our company is due on 31st July 2008.
Ms ***