Dear Mr. Thomson,
With regards to your letter asking for a reference for Mr. James, I can only say that I do not know him well enough to give a fair assessment of his ability, character, etc. Actually I was surprised that he gave my name as a reference at all. I was not informed of it.
Still I asked his immediate supervisor, Mr. Ken, and he said that Mr. James work is satisfactory. Mr. James works best if given proper supervision. In that capacity he should perform up to expectations.