nest thing to do is to develop your own data model, then you cna justify waht you have included in it and why, what you have excluded and why
but best of all whn it comes to subnmitting it to your teacher / lecturer they knwo its your work rather than soemone elses.
so over to you
what do you think comprises the requirements for a hotel reservation system
what entities do you see as beeing needed, what elemts do you see as neccesary to support those enitites.
if you are unsure have a look at
Paul Litwins bit on relational theory