A transcript of what?
Posts can be copied or pasted or you can perform a "Print Screen" operation then CTRL+V this into Paint and save it.
I assume chat exchanges can be highlighted, copied and pasted or "Print Screened" as above.
If you mean can you contact Facebook directly and ask them, good luck with that.
I found them are impossible to contact on even minor matters.
Too many customers I suppose...
ONQ.