iMessage conversation in pdf?

I want to download an entire iMessage conversation -with myself and another apple iPhone user- of about 2 years (25GB) in the form of a pdf.

Is it possible? My mac book was wiped clean and does don't have the history but my iPhone does. I can't however, see an option to share or download that conversation.

Is there away I can ask Apple to send me that data if I can't do it myself?