Student or Learner
You were asked about someone's health. The questioner was told that the person he asking about suffering from chronic disease. Would it be correct to say I am so sorry to hear that. I don't know. However, I will try my best to get you a copy from his check up report and send it to you to see it yourself correct?
What is the best response, concerning using correct English, in such a situation, please?
There is no correct English way of saying this. In all English-speaking countries that I know of, the situation is the same as in the US.
A: I've been told that Mr XXX is suffering from a chronic illness. Is that true?
B: Oh dear. It's very unfortunate if he is. I honestly don't know. However, I could contact his doctor and ask if he/she would be prepared to divulge that information. If so, I'll get you a copy of Mr XXX's latest medical report so you can see it for yourself.
Of course, for the reasons that others have already given, the most likely response from B is "I have no idea. You will/would have to ask Mr XXX yourself."
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.