Focused on something else now. It's easy to interrupt briefly, but getting back into the same concentration and rhythm takes time. So it's best to ask first when it's a good time.

No, I don't have a 'moment'. And what exactly is a 'moment' anyway? Be specific: what's this about, what do you need, and how long will it take? Keep it brief and to the point.

Often makes themselves available, even when it's not really convenient. Helping another person comes first; their own tasks can wait. Be mindful of that.

"Sure thing!" Before you know it, the conversation is no longer just about the initial question, and you've been chatting for ten minutes. Be aware of that.