Is this a polite request? In that case, in English we often add 'please', even if it is not in the original language. Without 'please' it can sounds rather bullying in English
Thanks! The difference is that when you say something about B, you tell person A about person B. B will probably not hear this; in any way, he is not the intended listener.
When you say something for B, you say something to B or you say something so that (eventually) B will hear it.