I started a new job a few months ago and two of the people I manage are not talking to me. They are clearly not happy with the way I am doing things and this is manifesting itself by not replying when I say good morning or good night and if I ask one of them how their weekend was I get a one word answer. Even when I need to talk to them about work matters they often wont look at me and say the minimum of what they need to. I have raised this with them - one of them says that as we are never going to be friends then it feels false to say good morning or whatever and the other is even more dismissive. I get on well with everyone else and I don't know if I should just leave it (just stop trying to engage) or not. What would you do?