Process when agents are unavailable

Content

When agents are unavailable to chat for any reason (left desk, not logged in, on a call, etc.), is there a way to limit the queue time after checking for available agents (2 minutes) and have a link to an inquiry form pop up so it can be completed and emailed to the agents for immediate assistance?  I don't want chatters waiting indefinitely in queue and I want to give them the option to try back or complete an inquiry form.