Qualify the building and the access before you promise a two hour window
An arrival window given without knowing the floor, the stairs and the elevator is a promise you will break in front of a paying customer.
The first three questions on a New York intake call are the address, the building type and how equipment gets in. Walk-up or elevator. Which floor. Whether there is a freight elevator, and whether it has to be reserved. Whether the building restricts work hours.
Answer those and the rest of the call changes. You know which crew, how long, roughly what it costs, and whether the job needs a site visit before a number goes out. Skip them and you dispatch a two man crew to a job that needed four and a scheduled elevator.
Add the ownership question early. Owner, shareholder, tenant, super or managing agent. A tenant in a rental is generally not the person who authorizes the repair, and finding that out at minute two rather than minute twenty saves the day.
Write the script down and use it. Most shops have a good phone person who does this instinctively and three others who do not, and the difference shows up entirely in the booking rate.