Casual — to friend
Shinkansen
すみません、席、少し倒してもいいですか? — Excuse me, do you mind if I recline my seat a little? (Shinkansen, Casual — to friend, JLPT N4)
You
すみません、席、少し倒してもいいですか?
すみません、せき、すこしたおしてもいいですか?
Excuse me, do you mind if I recline my seat a little?
Romaji: Sumimasen, seki, sukoshi taoshitemo ii desu ka? / Reply Romaji: A, dōzo, daijōbu desu yo.
Reply
あ、どうぞ、大丈夫ですよ。
あ、どうぞ、だいじょうぶですよ。
Ah, go ahead, that's fine.
Gesture & etiquette
Turn your head back slightly to make eye contact and nod politely.
Never recline your seat suddenly without asking, as it may spill drinks on the tray table behind you or hit the passenger's knees.