Product advice depends on distinctions that are easy to miss in ordinary conversation. Similar names do not guarantee compatibility; an old motorcycle may carry a style preference that the model name alone does not establish. More elaborate instructions will not repair an incomplete product record.
Separate the reference material from the rules of conversation. The reference establishes what is available and what fits. The conversational rules determine when to ask a question, when to offer an alternative and when to stop. These are different controls and should be tested separately.
A sensible trial includes cases where the correct outcome is no recommendation at all. If the tool can recognise missing evidence and explain what would resolve it, its limits become useful information rather than a surprise at the point of sale.