Joan?

是简吗？

May I speak with Mr. Chen, please?

可以请陈先生听电话吗？

We're already scheduled elsewhere.

我们已经有其他安排了。

And my phone number is 797-7963.

我的电话是797-7963。

Not at all.

不客气。

How much notice of cancellation is necessary to get my deposit back?

想把定金拿回来，要提前多长时间通知你才行？