Breakdown of A: situreisimasu. B: hai, douzo.
はいhai
yes
失礼します。situreisimasu.
Excuse me.
どうぞdouzo
please; go ahead
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Nihon-shiki romanizationwatasi ha tyuugoku kara kimasita
Hepburn romanizationwatashi wa chuugoku kara kimashita