This is first, great marketing, to position a voice driven assistant as an inexpensive luxury item for consumers. And then:
Depending on the hotel, add skills that are relevant to the local context:
When is the next show? Where is a nearby resource?
In a gambling center, add gambling skills.
In multi lingual contexts, provide simple language phrase training. ...
It is already being done, from TheVerge:
The Wynn Las Vegas is putting an Amazon Echo in every hotel room
4748 rooms by next summer.
Privacy is correctly discussed, there will have to be adjustments for devices of this type placed in semi public spaces.