Is this really just one SMS?

Type your message, add space for the name and link, and see how many texts it will use.

Keep it to one SMS
whenever you can.
Hi {{ first_name }}, your booking is locked in for tomorrow at 3 pm. Tap here to see details: https://yourlink.com
0 SMS
Most first names are around 4 to 8 letters.
If your platform swaps in a longer tracking link, add a buffer here.

This message

Segments now 0
Characters used 0
Characters left in this segment 160

With name and link added

Planned characters 0
Planned segments 0

Quick rule of thumb: keep your visible message around 120–140 characters once you allow for the name and link.