There is no default way to do this. It's not an optimal solution, generally, as it doesn't take into account load balancing (how long the load of existing tickets can take) or knowledge of request solutions. I hear there are third party options and other ticket systems that might do such things, but if you've got a ticket that is a "did you reboot your computer" and have to wait for n tickets (being assigned to your n coworkers) to come in before you are assigned another ticket, is that an optimal way to assign tickets?