Tourist guide for 4 day sightseeing in Zhangjiajie

I need to hire a mandarin speaking ( no need to be English speaking )guide for 4 day tour and sightseeing in Zhangjiajie. Please let me know where I can find one who is reliable and licensed and how much it would cost me per day. I am a Chinese and can speak and read Chinese but can''t write Chinese. I already made my hotel and airline booking for the last week of May. Please help. Thanks