yes
hai
JMdict 1010080
はい、yesわたしIはけんじKenjiです。
は (topic) raises わたし (I) as the topic — "as for me…". The name けんじ (Kenji) then fills the blank, closed off by polite です (is). は (topic) introduces, です (is) affirms — the basic "A is B" frame, made polite.