Ask a colleague a question, and the colleague says he doesn't know, and then he says he's sorry. What should he say at this time?

If you are usually rational and taciturn, just nod your head and go.

If you are more caring, you can answer: oh oh.

If you are more polite, you can answer with a smile: sorry, sorry.

Different individuals have different characteristics. Nature is more important, making the other person feel pure, not fake. I will not distort myself too much.

For reference only.