We have an African Grey parrot - my daughter said she was in the room and he was busy eating and dropped some food on the ground - he looked at it then vocalize

We have an African Grey parrot - my daughter said she was in the room and he was busy eating and dropped some food on the ground - he looked at it then vocalized "bye bye". We say "bye bye" to him whenever we leave the house. Another one is the phrase "kom kom" (come here) whenever he is outside on his perch and we want him to come inside. He then started using the phrase "kom kom" with my wife when he wants to be picked up by her.