YOU SAID:

i went to the mall to eat dinner

INTO JAPANESE

私は夕食を食べるためにモールに行きました

BACK INTO ENGLISH

I went to the mall to have dinner

INTO JAPANESE

私は夕食を食べにモールに行きました

BACK INTO ENGLISH

I went to the mall for dinner

INTO JAPANESE

私は夕食のためにモールに行きました

BACK INTO ENGLISH

I went to the mall for dinner