For this case we have to by definition:
The word chao comes from the Italian ciao.
Chao is a colloquial greeting in Spanish that is generally used for farewells.
Instead of "chao" you can use:
¡Adiós, nos vemos!
¡Hasta luego!
¡Hasta la vista!
ANswer:
¡Adiós, nos vemos!
¡Hasta luego!
¡Hasta la vista!