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That is exactly why they don't want the "hello". They want to know what the question is before they socially commit to answering it immediately.

that's an unusual style of communication. You are coworkers. If you don't know the answer immediately, say it.

Consider too, that i might be blocked as long as i don't have an answer.

Then say that you're blocked and need the answer soon. Communicate what you need instead of making the person you're reaching out to guess.