YOU SAID:

my iphone went missing on an over night flight while a guy is a black mask was sitting in the chair next to mine.

INTO JAPANESE

夜のフライトで私のiPhoneが行方不明になり、私の隣の椅子に黒いマスクの男が座っていました。

BACK INTO ENGLISH

My iPhone went missing on a night flight and there was a man in a black mask sitting in the chair next to me.

INTO JAPANESE

夜の飛行機で私のiPhoneが行方不明になり、私の隣の椅子に黒いマスクをかぶった男が座っていました。

BACK INTO ENGLISH

My iPhone went missing on a night flight and there was a man in a black mask sitting in the chair next to me.