When you create a meeting within Outlook, you can check the availability of the meeting rooms and book meeting rooms. 

Select new meeting to the right of Location there is a button called Rooms....  Clicking this button will bring up a list of available meeting rooms, and you can select whichever one you want to book. 

1. Click rooms to select what location you are interested in booking.
2. Select the first room you would like to book
3. Select more rooms if you want to check their availability and book whichever room is free at the time you need. You can remove rooms later once you have decided
4. The suggested times will recommend times to have a meeting as well as how many of the rooms you selected are available.
5. Once you select a time it will display above which rooms are available then
6. If you want to see a calendar view click here to open the Scheduling Assistant

To add people to the meeting and view their schedule:

1. Click Address book
2. Search the name of the person you would like to add
3. Select the person you would like to add to the meeting
4. Select if they are required or optional.
5. Once you have added all the users you would like to invite then press okay to view the calendar

Now you can see peoples calendars and when they are available. As well as this the Schedule Assistant will show you where there are conflicts with other peoples timetable ( 1 ) and when the rooms are booked for other meetings and are unavailable ( 2 ).

Now you can fill in the subject and description before sending and booking the room for you and the people you invited.