English

These are correct:

I am afraid he is not here at the moment.
I am sorry; he is not here at the moment.
I am sorry, but he is not here at the moment.

I am sorry he is not here at the moment (because I wanted to see him).

That's fine.

Did you mean which sentence is best to use? That is after making the mentioned corrections.There is not much difference in meaning between the two sentences. The second one is a more courteous way of saying it.

I might say I’m sorry I snapped at you earlier, but it would be odd to apologize to someone for another person’s absence, which, in my reading, is what I am sorry he’s not here at the moment means.

pathfinder1992There is not much difference in meaning between the two sentences. The second one is a more courteous way of saying it.

Which two sentences are you talking about?

Aspara Gus I might say I’m sorry I snapped at you earlier, but it would be odd to apologize to someone for another person’s absence, which, in my reading, is what I am sorry he’s not here at the moment means.

In 'I am sorry he is not here', the speaker is expressing their own regret, not apologising.

fivejedjonIn 'I am sorry he is not here', the speaker is expressing their own regret, not apologising.

That’s a new one for me. I’m not familiar with that use of sorry at all. I would say I wish he were here to express that meaning.

fivejedjonWhich two sentences are you talking about?

The two sentences by the original poster

I am afraid he is not here at the moment
I am sorry he is not here at the moment