Messages that answer the question first.
[Company]: We are working on a service outage in [area]. Expected fix: [time]. We will text you when it is resolved. Reply STOP to opt out.
[Company]: Hi [First name], your [service] visit is on [date] between [time window]. Reply to this text if you need to reschedule. Reply STOP to opt out.
Hi [First name], this is [name] from [Company] with a quick update: [what is changing and when]. You do not need to do anything. If you have questions, text or call us at [number].

