Nothing dramatic — you stop trying to manufacture it. The documented rule is “don't force rapport.” A flat warm-up usually means the homeowner is businesslike, not hostile, and matching their temperature is the warm-up working correctly. Stay positive, keep the talk about them, and move into the appointment on schedule.
The short answer
Rapport cannot be forced because the homeowner can feel the forcing. The rep who keeps casting for a personal connection — another topic, another joke, another compliment — teaches the room that this appointment is about his performance. The doctrine accepts the room as it is: some people warm slowly, some never warm at all and still move forward, because the decision was never going to be built on chat.
How it runs
The correct adjustment is length and tone, not effort. A shorter, professional warm-up that keeps the conversation on them — the home, the reason for the visit — respects a businesslike homeowner and preserves your credibility for the parts of the appointment that matter. What you must not sacrifice is positivity: flat is fine, cynical is fatal, and the rep's mood is contagious in both directions.
Watch, too, for the difference between flat and guarded. Guardedness about the process — how long this takes, what it involves — is a concern you can surface and answer. Flatness about small talk is just a person. Sell to the person.
Every guide on this page is a round you can run in Fight Camp — $29/month for the full camp, Round 1 free. Spar before you knock.