In Campaign Customization, you can edit the SMS and use a variety of Merge Tags to dynamically customize the content in the message.
Contact - First Name
Contact - Full Name
Assigned Staff - First Name
Assigned Staff - Full Name
Account - Name
SMS - Appointment CTA
While most of these are self explanatory, the SMS - Appointment CTA needs some more context.
When you include the SMS - Appointment CTA in the message, it will display as {{ sms_cta.block }}. This dynamic text will pull in a link to book an appointment during the New Lead Campaign. If they already have an appointment booked, it will not merge the link.