Formal — to staff
Ramen · Shop · Ticket · Machine
You
すみません、お札が何回も戻ってきちゃうんですけど、別のに替えてもらえますか？
すみません、おさつがなんかいももどってきちゃうんですけど、べつのにかえてもらえますか？
Excuse me, this bill keeps spitting back out. Could you exchange it for another one?
Romaji: Sumimasen, osatsu ga nankai mo modottekichau ndesu kedo, betsu no ni kaetemo raemasu ka? / Reply Romaji: A, suimasen. Kikai no choushi ga warukute. Kochira de ryougae shimasu ne.
Reply
あ、すいません。機械の調子が悪くて。こちらで両替しますね。
あ、すいません。きかいのちょうしがわるくて。こちらでりょうがえしますね。
Ah, sorry about that. The machine has been acting up. I'll exchange it for you here.
Gesture & etiquette
Hold the bill slightly flat with both hands and tilt your head with a troubled expression toward the ticket machine.
Do not try to force or push a crumpled bill into the slot repeatedly as it can jam the machine. Avoid tapping or hitting the screen.