An instructor could ask for the language, presentation date and context: studies, work or a personal project. The first session would establish an achievable goal. Follow-up would preserve the work plan and agreed exercises, with a place for questions between meetings under the stated arrangements, helping the learner understand what support is included.
An illustrative example to adapt to your business. It does not represent a completed project in this municipality.
Should the website show only standardized levels?
They can help, but describe the situations practised as well. Someone preparing a presentation should recognize that need even when they do not know their exact language level.
How can recurring lessons and one-time preparation differ?
Present separate formats with their duration and goals. The enquiry can direct someone toward a focused session without automatically committing the customer to a continuing series of lessons.