YOU SAID:

I want one invitation to this party.

INTO JAPANESE

このパーティーへの招待状が1つ欲しいのですが。

BACK INTO ENGLISH

I would like to have one invitation to this party.

INTO JAPANESE

このパーティーへの招待状を1つお願いします。

BACK INTO ENGLISH

Please give me an invitation to this party.

INTO JAPANESE

このパーティーへの招待状をください。

BACK INTO ENGLISH

Please give me an invitation to this party.