Please check for any errors. If there are some errors please correct them for me.
When you were in my office last Tuesday, you stated that you wanted to alter your will to include two additional heirs. I have now prepared a will in compliance with your instructions.
Please come to my office Monday at 10 a.m. to execute your will. If this time is not convenient for you call my assistant to arrange a more convenient time.
Add the word "on" before "Monday".
Read that last sentence aloud. Where do you need a comma?