Helpdesk Ticket/Software Bug Tracking Application

We want to track Software bugs Its is like Help desk ticketing system.

1. The application should display dashboard with multiple graph in the dashboard
2. Each application will have multiple bug, which status can be changed to : Open , IN progress , Closed, Need Escalation.
3. Multiple login with role base
4. Flexible Report.
5. Simple and Appling Designee needed
6. The Web Site should be dynamic