How to convert a string into a room

Good afternoon

I would like to request the help of any of you, I am making a dynamo routine for the internal finishes of a room, I have found several tutorials to perform this type of exercise, but what I am looking for is to specify the rooms, ie, I select the name of the room, and that particularly give the finishes, but the problem lies in the individual selection of the room, because when I give it a name it returns me a string, and I need to turn that string into a room or convert it into a geometry, I appreciate if someone can help me in the completion of this routine.

thank you

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