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お忙しいところ、恐れ入ります
Thank you for your time.
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恐れ入りますが
excuse me but (formal for すみませんが) for clients & strangers
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恐れ入りますが、Oさんをお願い致します
Excuse me, but I would like to speak with Mr./Ms. O.
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お待たせしました
I'm sorry to have kept you waiting
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Oさん、XXのX様からお電話です
O, you have a call from Mr./Ms.X