YOU SAID:

i dont believe we've met. when are you going to the party?

INTO JAPANESE

会ったなんて信じられない。いつパーティーに行きますか？

BACK INTO ENGLISH

I can't believe I met you. When do you go to the party?

INTO JAPANESE

あなたに会ったなんて信じられない。いつパーティーに行きますか？

BACK INTO ENGLISH

I can't believe I met you. When do you go to the party?