Given the task definition and input, reply with output. In this task, you will be presented with a context from an academic paper and a question separated with a
. You have to answer the question based on the context.

We apply Han to such conversations in a sequential manner by feeding each user turn to Han as they occur, to determine if the conversation should escalate. If so, the user will be transferred to a live chat representative to continue the conversation. The user must wait for the human representative to review the IVA chat history and resume the failed task.
Question: How do they gather human reviews?
human representative to review the IVA chat history and resume the failed task