A support assistant earns trust when an answer can be traced back to a useful source.
Retrieval belongs in the answer
RAG is not a promise that a model knows everything. It is a way to make retrieval part of the response: find the relevant company material first, then formulate an answer in its context.
For support teams, that changes the work from producing plausible text to helping a customer take the next correct step.
The question comes first
The useful question is not “can the assistant reply?” It is “what would a person on the team consult before replying?” The answer may live in a help article, a policy, a release note or a carefully maintained internal guide.
When those sources are visible and current, an assistant has something concrete to work with. When they are not, confidence in the wording cannot replace the missing knowledge.
Trust is a product decision
Grounded support makes the limits of an answer easier to see. It gives a team a place to improve: update the source, clarify a policy or add the detail customers actually ask for. That feedback loop is more valuable than a convincing answer with no way to verify it.