Casual — to friend
Hotel · Trouble
部屋に忘れ物しちゃったんだけど。 — I left something in my room. (Hotel · Trouble, Casual — to friend, JLPT N4)
You
部屋に忘れ物しちゃったんだけど。
へやにわすれものしちゃったんだけど。
I left something in my room.
Romaji: Heya ni wasuremono shichattan dakedo. / Reply Romaji: E, so na no? Nani wasureta no? Furonto ni kiite miyou ka?
Reply
えっ、そうなの?何忘れたの?フロントに聞いてみようか?
えっ、そうなの?なにわすれたの?ふろんとにきいてみようか?
Oh, really? What did you leave behind? Should we ask at the front desk?
Gesture & etiquette
Look concerned, tilt your head slightly, and gesture towards the hotel entrance or front desk area.
Avoid using polite endings like desu/masu as the relationship is casual. Do not sound indifferent to the friend's trouble.