Then you can say "hi, do you have a moment for a quick chat? I'm free until 4". Be aware that this can cause a heart attack or panic if you are in a position o

Then you can say "hi, do you have a moment for a quick chat? I'm free until 4". Be aware that this can cause a heart attack or panic if you are in a position of power over the recipient. Saying something like that to your manager can work wonders, though.