UAT mayhem

The project manager has decided to have a UAT 'walk through' instead of a full fledged UAT. Clearly the cry raised during CRP has shaken her up. And they want to take it in easy. However without a UAT when will the users be trained on the system ? How will they ever be able to support their users ? how will they sign off on the system ? Probably IT will trade off with HR...this is the political nature of 'change management' revealing itself...