Han, Isaac

Dear Sally Albright,

I am writing with regard to when you get back to the office and whether you have the right brochures.

Please find attached files. They will include a sales report for the last business quarter, a spreadsheet of clients she should try to meet, a forecast of future sales and the new specifications for minimal requirements for use of your software. This information would be useful if you check them before the conference.

Best regards,

Han, Isaac
_____________

Dear Sally Albright,

I am writing with regard to when you get back to the office and whether you have the right brochures. (AWKWARD)
(TRY SOMETHING LIKE THIS:) I am writing with regard to your itinerary. When will you be getting back? Also, I'm not certain if you have the right brochures. Would it be possible for you to check before you leave? (IT'S LONGER, BUT IT'S A LITTLE MORE EFFECTIVE, SINCE THE ITINERARY AND BROCHURES ISSUES ARE NOT ACTUALLY RELATED)

Please find (the) attached files. They will include a sales report for the last business quarter, a spreadsheet of clients she (you) should try to meet, a forecast of future sales and the new specifications for minimal requirements for use of your (our) software. This information would be useful if you (have a chance to) check them (it) before the conference.

Best regards,

Han, Isaac

Jonathon's Tips:
Good use of the target language overall. Actually, it's pretty well-written, with a few minor errors in grammar or pronoun use. Just make sure you don't include quite-different issues in the same sentence, as it may result in awkward language. Good job!