请帮我看下这句话有什么错误?
I did administritive assistant for over 1year in Xuanwu Real Estate Operating Company (public institution change to enterprise institution).
i'm a conscientious person who likes to do the best I can with my given potential and I have good team spirit,my personality is composed,sureness,willing to communicate with all levels people,thus made many friends,and also can actively assist supervisor successfully completed the work.
i'm sure you won't be disappointed if you give me a chance.