DISboards doesn't allow posting of specific scripts, as each individual's needs may be unique even with the same/similar diagnosis.
You (or someone on behalf of the individual) should discuss the person's NEEDS as specifically related to waiting in a standard queue environment. Think of other situations where a queue is involved and how that individual handles reacts -- maybe a line at the movie theater, long line at a check-out counter, fast food, bouncy house at a local festival, etc.
Enjoy your vacation!