An advanced AI assistant is being built to help a user plan a complex international trip. One of the critical sub-problems the assistant must solve is to find the absolute cheapest, currently available flight between two specific cities for a given date. To ensure the highest degree of accuracy and reliability for this particular task, which type of specialized system component should be used to solve it?

An advanced AI system is designed to handle complex user requests by breaking them down into smaller, distinct tasks. For each task listed below, match it with the most appropriate and reliable specialized system component to solve it.

Improving AI Assistant Reliability