Casual — to friend
Lost & found
財布、落としちゃった。 — I dropped my wallet. (Lost & found, Casual — to friend, JLPT N4)
You
財布、落としちゃった。
さいふ、おとしちゃった。
I dropped my wallet.
Romaji: Saifu, otoshichatta. / Reply Romaji: E, maji? Doko de saigo mita ka oboeteru? Issho ni sagasou!
Reply
えっ、マジ?どこで最後見たか覚えてる?一緒に探そう!
えっ、まじ?どこでさいごみたかおぼえてる?いっしょにさがそう!
Wait, seriously? Do you remember where you saw it last? Let's go look for it!
Gesture & etiquette
Look concerned, widen eyes slightly, and offer a pat on the shoulder.
Do not sound overly formal or distant; maintain a supportive, friendly tone.