The first five minutes after a new lead
The person who just called or filled out the form is still deciding. What you do before the next customer walks in is the whole job.
They are still on the page
A new inquiry is not a task for later in the day. The person searched, compared two or three businesses, and raised a hand. For a few minutes they are waiting to see who answers like a real office.
A reply that says “we will be in touch” sends them back to the search results. A reply that names the next open time gives them a decision they can make right now.
Offer a time, not a promise
The useful message is short. Thank them, name the service they asked about, and offer two times that are actually open. Ask which one they want. That is a booking conversation, not a lead notification. Online booking on the page does the same job for the people who would rather pick a time than talk.
If the front desk is with a customer, the reply still has to go out. The follow-up system should send it. A human can take over the moment someone is free. The first text should not wait for that moment.
Put it on one record
The form, the call, and the text belong on the same customer. Otherwise the afternoon shift calls someone who already booked, or nobody calls the person who only left a voicemail.
Five minutes is enough to answer, offer a time, and file the inquiry where the rest of the office can see it. Everything after that is follow-up. The first five minutes are the visit.
If the inquiry was a call that rang out, the same clock is running. A missed call is a missed visit unless a text goes back before the caller dials the next number. For the numbers behind the five-minute rule, read the speed-to-lead benchmarks.