his own agenda

Buni is eager to have Pepe in Romania for a visit. My brother has been building a new house in Bran, at the mountains, and mom has been overseeing the project. She had to rent an excavator when the house was ready, to clear up the yard for a deck. This happened about 2 months ago, and she had the excavator there when Pepe and I called her. I told Pepe that Buni has an excavator, and, since then, he keeps mentioning it. Like today. I called Buni this morning..
P: What you doing?
AM: I am calling Buni. But she is not home..
P: But her excavator is there...