A: This is Lina. I want to make an appointment to see a doctor.

我是丽娜。 我要预约看医生。

B: What's the problem?

哪里不舒服?

A: I have a fever and a pain in my abdomen.

我发烧，而且肚子疼。

A: Is he available this afternoon?

今天下午他有空吗?

B: He is available at 3:00 to 4:00 this afternoon.

他今天下午三点到四点间有空。