iMessage conversation deleted!!! How can I get it back?

So i have accidentally deleted an imessage conversation with a lottttt of photos that id like to keep for sentimentality! the conversation is backed up on my laptop to iCloud. Me and the contact have started a new conversation since then with messages and photos again id like to keep. is there anyway i could insert the old conversation essentially into this new conversation just behind the new messages? thanks!!!!!!

you can wipe the phone and do a restore from your last iCloud back up but my guess is that was done last night so anything you did today would be lost