I might be generalising a bit when I say this but from experience and what other have told me, Chileans tend to be quite unreliable people, in particular with their time keeping abilities. This may not be all of them but so far from the ones I have had to deal with I am led to believe that most of them are like this. Making plans and keeping to them is a very stressful past-time.
I have just been informed that it most Chileans, just the odd exception.