I do not know the answer yet, but I have done some observations. I post them here so others could maybe benefit from them.
There are 12 persons in 12 rooms, with number 13 to be placed.
All names have equal number of letters, 6 in firstname, 7 in lastname, in total 13 letters. Firstnames seems to start with different letters, but Bobbie and Buster disrupt the pattern. Same goes with lastname, but here there are three pairs on A, C and P.
All dates are different.
All days of the month is different as well.
All Months are different, except the one to be placed.
All years are different as well. Some are ending in the same digit, and this shows some relation to the last digit of the room number. But here there are a break in the pattern as well.
These are the undisputable facts.
Here comes some of my speculations also:
I suspect that the number 12 is central to this puzzle. There are 12 Months, and since they are never used twice, I do think that two persons born in the same Month would be revealing to the puzzle.
Since a lot is different, but still similar, I suspect that all parts of name and birth date is needed. It looks like a calculation of some sort. (This could however just be a trick of concealing the clue in between unnecessary hints). 13 letters combined with the month number could also lead to something.
Another point to consider is whether the room numbers has to be unique (that means running numbers, building on eachother), or that if the right person with the right birth date comes along, someone would needed to share a Double room?