Can I leave a message？ 我可以留个话？
1) Yes. Go ahead, please. 可以，请继续。
2) Of course. Hold on for just a second so I can grab a pen and paper.
当然， 稍等一下让我拿个纸笔。
3) Sure, if you can excuse me for just a second. Let me find a piece of paper to write it down.
当然，你等我一下下，让我找张纸记下来。