What time should I call back?

我应该何时再打来？

I see. May I leave her a message then?

噢，那我可以留话给她吗？

Oh, how do you do, Xiao Fu. This is Mary.

哦，你好，小付。我是Mary。

Seven o'clock, I'll pick you up at your office.

晚7点，我去办公室接你。

By the way, will we be able to get a refund on this cancellation?

顺便问一下，我们取消后可拿回定金吗？

I'm calling for your assistance.

我打电话是要您帮助我。