Generally, engage with one of the partners, a lot of them do demos of software.
You'll probably want to tell them more than "show me Jira" if you want to get much out of a demo though, as there's a LOT of material to work through on Atlassian's site as well as non-Atlassian places like youtube etc. Any search for "jira demo" will net you huge numbers of resources.
But if you want a partner demo, start at https://partnerdirectory.atlassian.com
For JSM June Challenge #2, share how your non-technical teams like HR, legal, marketing, finance, and beyond started using Jira Service Management! Tell us: Did they ask to start using it or...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events