Based on the context and the answer, generate a question. 

Context: I have to say at the start , that I think the Air NZ call centre is really great . Every time I call them , I get what I want with generally a minimum of fuss . And this is just the 13 24 76 number that anyone can call .

Answer:

The Air NZ call centre has a great training program for its ' agents .



What makes the customer service great at the Air NZ call centre ?