Translation of "bye bye" into Garo

In A·chikku mainly Am·beng and A·we , traditionally there's no exact words for bye bye but the words salnam and walnam is used depending on time of the day , if you want to say bye during the day you say ra/de salnam and move on and ra/de walnam during the evenings or if you'll never see him/her on the same day . The word salnam means good day and walnam good night. But modernly ba bai is used .