convenient的名词形式?

We have provided seats for the convenience of our customers.

为方便顾客我们备有座位。

A glossary of terms is included for the reader's convenience.

为了方便读者，还收录了术语汇编。

Can you telephone me at your convenience to arrange a meeting?

你能不能在你方便时给我来个电话，安排见一次面？