2 sentences

1. 他在待人接物方面非常得体。

   tā zài dài​rén​jiē​wù fāng​miàn fēi​cháng dé​tǐ.

   He is very proper in the way he treats people and handles affairs.

   Source: Dong Chinese Dictionary

2. 他是一个非常有修养的人，待人接物很懂礼。

   tā shì yī gè fēi​cháng yǒu xiū​yǎng de rén, dài​rén​jiē​wù hěn dǒng lǐ.

   He is a very refined person and is very polite in his dealings with others.

   Source: Dong Chinese Dictionary