Hi Anelise,
Unfortunately, It is not uncommon for Airlines to give little notice for assessment days. I've been too 2, and both of them I was given 4 days notice (which isn't as bad as 2 days, but it certainly feels rushed when you have to organise flights!). My conclusion is they must do this because it certainly shows your determined.
I have a friend who declined a Virgin ground crew interview and got a invite to the next available one the week after. It can happen- I don't honestly see how it would be a black mark against your name. I know that Virgin are hiring on the website at the moment, I have heard on the pipeline that it is only a expression of interest. Still, just keep applying, I see no reason why you have any less chance of getting a invite next time they do have a assessment day. Hope that helps!
