I have a complicated relationship with this situation. On the one hand, just tell me what you want. On the other hand, if you feel rude go ahead and send me a hello first. But on the other other hand it distracts me until you say what you want. But on the other other other hand if I'm doing something else I shouldn't be stopping to check my chats which are necessarily not urgent. But on the other other other other hand what if it is urgent? So then I check it and it just says "Hello". And I can see them typing so I wait 3 or 4 minutes. And then they stop and the typing bubbles go away, so I go back to what I was doing and then they finally send their question: "How are you?"