Learning When to Automate: Queue Control in Human-AI Service Systems

We study a human-AI service system in which tasks arrive sequentially and are processed through a two-stage architecture: an automated chatbot followed, when necessary, by a human agent.

We consider $T$ sequentially arriving tasks, each belonging to one of $K$ heterogeneous types.

For each task the decision maker chooses how many resources to allocate to the chatbot, whose type-dependent success probabilities are initially unknown.

Tasks not resolved by the chatbot enter type-dependent human-service queues, where they are processed by a human agent with unknown service rates.

This model captures a central tradeoff in hybrid service systems: relying more on automation reduces human congestion but increases chatbot costs, while insufficient automation may overload the human agent.

We propose the UCB-DPP policy, which combines Upper Confidence Bounds with Drift-Plus-Penalty control to learn the unknown parameters of the system while making queue-aware decisions.

We prove that UCB-DPP achieves regret $\widetilde{\mathcal{O}}(K\sqrt{T})$ and guarantees mean-rate stability of the human-service queues.

Simulations on synthetic instances show that the proposed policy outperforms natural baselines.