Our general manager Mr. Wu asked me to say "hello" to you.
我們的總經理吳先生讓我轉達他對你的問候。
He meant to come here to meet you in person.
他本打算親自來接你。
But some other business held him back, so he asked me to come in his place.
他因公務纏身，才由我替他來接你。
半個句型要記牢
in person(親自)
Tip:固定搭配，相當於 personally。另外注意 ask me to say hello to you和 take/ give my greetings/ regards to sb.的區別，前者是轉達某人對對方的問候，後者表示要對方代自己向某人問好。