If a teacher offered paired lessons, the form could ask about instruments, experience and shared goals. Both participants' availability would be collected before suggesting a time. An initial session would help confirm the format. The page would explain supplied equipment, what to bring and how to request a change if one participant cannot attend an agreed lesson.
An illustrative example to adapt to your business. It does not represent a completed project in this municipality.
Must both learners have the same experience?
The page can explain which combinations the teacher actually accepts. A brief preliminary conversation would help establish whether the goals allow useful shared work for both participants in the lesson.
How would the teaching language be chosen?
The form could ask for a language preference and show the teacher's actual options. Confirmation would use that language for instructions and reminders so the learners know what to expect.