Welcome to Apple Discussions Kelly
There is no installing fonts specifically for Pages. Fonts are installed for all applications to use, although some Adobe applications may be an exception. Microsoft Office has been known to install fonts in the user library of the user who first runs any of the applications rather than in HD > Library > Fonts where they would be available to all users. If you can find the font in another user's fonts folder, you could move it to the main Library folder & it should be come available to Pages.
If you don't have the font, I'm not sure how you would get it without install a Microsoft program. The trial of Office: Mac 2004 would install fonts, but I don't know if that trial/test drive is still available since Office 2008 came out.
