I have a 5 and I do not have Suri? Where did it go?

Turned on...Settings>General>Siri>On?

Restricted...Settings>General>Restrictions...yours on...Siri>On/Off?

Read this to be sure that you're following the correct procedure to use Siri:

http://support.apple.com/kb/HT4992

If that and WJ's suggestions don't help, Apple has other troubleshooting steps here:

http://support.apple.com/kb/TS4079

Regards.