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Kon'nichiwaha! Watashi waha, watashi no ryokō keikaku no tame ni nihongo wo benkyō shite imasu.

Konnichi"wa" & watashi "wa" ←"ha"　"Konnichiha" and "watashi ha" is correct.

We pronunce "wa" but we write "ha"  It's complex, isn't it?

O and Wo are different. Wo→を　O→お (Hiragana)