Formal — to staff
Convenience · Store
You
すみません、これ温めてもらえますか？お箸もお願いします。
すみません、これあたためてもらえますか？おはしもお願いします。
Excuse me, could you warm this up for me? And chopsticks, please.
Romaji: Sumimasen, kore atatamete moraemasu ka? Ohashi mo onegai shimasu. / Reply Romaji: Hai, kashikomarimashita. Ohashi mo otsuke shimasu ne.
Reply
はい、かしこまりました。お箸もお付けしますね。
はい、かしこまりました。おはしもつけしますね。
Yes, certainly. I'll include chopsticks for you.
Gesture & etiquette
Hold up the item(s) you want warmed. Point to the chopsticks if visible, or make a gesture like holding chopsticks.
Make sure to clearly indicate which item(s) you want to be warmed if you have multiple purchases. Sometimes, staff might ask '何本ですか？' (Nanbon desu ka? - How many [chopsticks]?), in which case you can reply with the number followed by 'hon' or 'tsu' (e.g., 'nihon' for two).