由“he is the only technician available to go out and deal with them”可以得出答案。

听力原文：

W: Where is Jack? His manager is trying to catch him several times but has always just missed him.

M: That's because he is being in and out all day.

W: What's been going on?

M: It has been many emergency calls and he is the only technician available to go out and deal with them.