回答
2020-10-14 12:07:25
Kevin@MusicoLingo
Assistant という job title は、その一語だけだと、対外的な仕事をする立場の人ではないので、Executive Assistant か Secretary が良いと思います。
Effective October 1, 2020, the Secretary for Mr. Donald Trump is Mr. Kim Jong-un. Please contact Mr. Kim from now on.
もっと丁寧なメールにするなら、
We would like to inform you that, effective October 1, 2020, Mr. Shinzo Abe is no longer your contact for communication with Mr. Donald Trump. Mr. Abe has taken another position in our organization. We have appointed Mr. Kim Jong-un as the Secretary for Mr. Trump to perform all the duties that Mr. Abe previously performed. Please contact Mr. Kim from now on.
メールでも無料で質問にお答えします。
kevin@musicolingo.com