I am wondering if I can use the em dash with a quote. If I can use them, I am curious of whether it would mean that the writer is telling the audience that information, or if it means that the person speaking had said the entire sentence, yet the transcriber added the em dashes in order for the sentence to appear grammatically correct to the reader.
Can I use them in a quote? And if so, can I use them to show what the speaker said? Or do they only imply that the author is commenting or supplying new information?
"We ended up going to Red Robin — the only restaurant still open at that time — to get some food."
"We ended up going to Red Robin, the only restaurant still open at that time, to get some food."