YOU SAID:

I am going to get lunch

INTO JAPANESE

私は昼食を取るつもりです

BACK INTO ENGLISH

I'm going to have lunch.

INTO JAPANESE

私は昼食を食べるつもりです。

BACK INTO ENGLISH

I'm going to eat lunch.

INTO JAPANESE

私は昼食を食べるつもりです。

BACK INTO ENGLISH

I'm going to eat lunch.