Try this. In your ticket type "IT Support" or something like that, Alter Custom Fields and add in Location and/or Office Location. Location by default is probably still Textbox. Office Location is probably still Combobox. You'll have to experiment with these options or create one that fits your needs.
Add them to your service ticket as needed. Make them Required by the end user if input manually. Other methods of ticket generation may get past the hard requirements.
Now on your ticketing screen, using the Select Columns button you can add these two columns in under the Custom Field heading. Make sure to press the floppy disk icon to save the layout.
This should work for all users entering tickets in manually. You may have to adjust your automated ticket scripts to add these fields in automatically.