Note: Office 2013 is shown below. There might be some diferences with other versions.

Go to the Calendar tab, located in the bottom left side of the screen.

Located in the top left side of the screen is the New Meeting option.  Click on it.

Now you will see a window that is used to fill in information like subject, location, and time.

The meeting location field can hold either:

A specific room identifier from the campus directory.  If you want to reserve a conference room, the location field needs to have a specific room identifier that Outlook recognizes.   If it doesn’t have that identifier, the room will not be reserved.  You will need to use the Rooms… button or the scheduling assistant to book the actual room

A general description that you enter. For example, if you are setting up a meeting with William Jenks and want to propose having the meeting in his office, you can enter “William’s office” in the location field. 

Click the Scheduling Assistant option, available in the top part of the screen.

To reserve a conference room: In the bottom left side of the screen, Click Add Rooms. It gives global list of all conference rooms at Iowa State University.

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Start typing the hall/building where the room is located. This will either populate the list or narrow down the options. Double-click the room needed and select OK.

In the bottom left side of the screen, Click Add Attendees. It gives global address list at Iowa State University.

You can add the other recipient(s) from this list. Double-click the name & select OK.

Once that is done, the scheduling assistant will show the availability for both the recipient(s) and the room.

Click in the columns, where nothing is scheduled. In the bottom right side of the screen (Suggested Times), it would show if there is any conflict as per various time slots.

After a selection is made, click Send.

An email is sent to the recipient(s) for their approval.

The recipient(s) has the option to accept, decline and reschedule.