题目memo要求Mark is an employer in your company,and he requests

To:Mark
From:Manager
Date:June 26,2013
Subject:Requirement reject
Due to a lack of hand,I feel sorry that I have to decline your requests to take part in a professional meeting.
It is good for you to attend such meeting,but the time that the meeting is going to be held coincidentally collides with the schedule of your work in the company,and no one is available here to substitute your position to do the work.Thus if you go to the meeting,your work would be left undone and this will disrupt the company daily operation.
For the above considerations,I sincerely require you to stay at the company to fulfill your duty because your stay would ensure the smooth operation of our work.Thank you.