"allocate a room" is correct and usable in written English.
You can use it when you are talking about assigning or designating a room to someone for a specific purpose. Example: The conference center staff had to allocate a room for our meeting.
We've been allocated a room at the suitably regal Grand Hotel, in the city's historic Opéra district.
Each of the parties were allocated a room in which to sing, shout, and rage at big screens for the night.
To be allocated a room, one had to meet the committee's criteria and once were admitted one had to abide by the master's rules.
The concerned zonal office of the Dhaka City Corporation (DCC) allocated a room for this purpose.
All families are informed of this option at the first meeting with the ICU staff and rooms are allocated when available (i.e. no specific criteria for allocating a room are applied).
Providers also pointed out the need of allocating a room specific for cervical cancer screening and treatment as in most facilities the services were offered in family planning rooms which were always busy.
Practical steps for supervisors to connect their student with peers in this way included assigning a "previous student" as a mentor or tutor to the new student in a large ongoing project and allocating a room to the new student with other students, including postgraduate research students.
It was the first New York hotel to allocate an entire room for afternoon tea.
I'd been allocated a shared room, with no say over my room-mate.
By its mere existence it's pointing to the fact that this is important…so much so that we're allocating a whole room to it…it's significant when you're giving away real estate" (N20) "a family room is basically saying, this [family connection] is so important we've made a room specific for that and there is an expectation that families can visit and use this space…it places emphasis on family.
