YOU SAID:
I'm going to eat dinner with my sister
INTO JAPANESE
私は姉と夕食を食べるつもりです
BACK INTO ENGLISH
I am going to have dinner with my sister
INTO JAPANESE
私は姉と夕食をとるつもりです
BACK INTO ENGLISH
I will have dinner with my sister
INTO JAPANESE
私は姉と夕食をとります
BACK INTO ENGLISH
I have dinner with my sister
INTO JAPANESE
私は姉と夕食をとります
BACK INTO ENGLISH
I have dinner with my sister
You should move to Japan!