You have access to many reports in ServiceNow. You may be able to make changes to a existing report and save a customized copy for yourself or your group, depending on your role.
Once you have run the report and determined its use to you, make a copy of the report before customizing it for your own needs. See Modify an Existing Report for guidelines on customizing a report.
Get Started with Reports - This article links to reports you can use as a template to create your own.