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osoreirimasuga,O san o onegai itashimasu
Excuse me, but I would like to speak with Mr./Ms. O.
onegai shimasu
Please.
korede onegai shimasu
I'd like to pay with this.
sumimasenga
Excuse me but...
dengon o onegai dekimasuka
May I leave a message?
--mitai ni shite kudasai
Do it like -
(go)jibun de yatte itadakemasuka
Could you try to do it yourself?