If nothing was unclear or difficult, say so. Skip questions about steps you did not experience; use not applicable where appropriate.

What did the kiosk ask about?
Which response instruction was unclear?
What privacy explanation did you need?

Author notes / illustrative keys where applicable:
1. Ask visitors to explain the kiosk purpose before judging the interface. A visitor who expects a complaint form may respond differently from one expecting a short public-space questionnaire.
2. Keep the exact control or instruction the visitor could not use, such as Submit, Skip or a required-answer notice. This separates wording repair from a touch-screen or timeout problem.
3. Identify which handling fact was missing: whether the answer was sent, who receives it, or whether identifying information is requested. Confirm those facts with the operator before changing the notice.