what's the difference of different tense

[Snoowoo]

someone is looking for my colleague in the same office.My colleague is not here but he came here this morning,I should tell him:
He comes but he is not here now
or He came but he is not here now
or He has come but he is not here now
which one is correct or nature?

[Milanya]

I have seen him come in but he is not here at the moment.
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.

[Kitosdad]

He was here, but he left. ( He may be back later, but I'm not certain.)
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