我要换我的理发师。

I'm going to change my ___hairdresser.

我在理发店预约了四点钟。

I've got a four o'clock appointment at the ___hairdresser's.

我决定去理发店剪头发，因为第二天我得去参加派对。

I decided to go to the ___hairdresser's to have my hair cut because the next day I had to go to the party.