Dragon tree (?) has wilted, how do I revive it please?

Greetings fellow greeners,
Unfortunately someone has wilted if not maybe killed off my plant.
It it was moved (not by me) to a very cold conservatory. It looked okay at first then now looks like pic.
It it is now in its normal spot but should I trim the leaves off and where from...
Many thanks for any advice.
Unfortunately someone has wilted if not maybe killed off my plant.
It it was moved (not by me) to a very cold conservatory. It looked okay at first then now looks like pic.
It it is now in its normal spot but should I trim the leaves off and where from...
Many thanks for any advice.

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... and I wouldn't water it until you see signs of life ... keep the soil just a little damp to the touch.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.