The person standing at the thermostat is often a guest or a cleaner
Your first question should establish authority, not symptoms.
A call comes in at eight in the evening from a house near Celebration. The caller describes warm air and a running fan. Your CSR books a service call. Nobody asks who they are.
The caller turns out to be a guest three days into a week's stay. They cannot authorize a diagnostic, they will not be paying, and the property already has a vendor. The truck went out anyway.
Change the first question. Are you the owner, the manager, a resident or a guest at this property. Four seconds, and it routes the entire rest of the conversation.
When the answer is guest or cleaner, the job is not to book, it is to capture. Take the property address, the symptom, and a way to reach the owner or manager, then make that contact yourself. Handled well, a guest call becomes an introduction to a portfolio.