Air NZ ribs Game of Thrones author George RR Martin with tweet in Valyrian

Air New Zealand has called out writer George RR Martin on the long-awaited release of the next two Song of Ice and Fire books, offering a solution to any writer's block that might be delaying proceedings.

Quite literally speaking his language, the Kiwi airline tweeted Martin in Valyrian - a language originated in his novels and later fully-realised for the Game of Thrones television series.

"Everyone really wants your next book finished. But we heard you might be having a little trouble," the message reads, according to a Valyrian translator.

"So what if we fly you down to New Zealand for free? It's one of the most inspiring places, perfect conditions for book finishing."

Earlier this month, Martin denied rumours he had already finished the sixth and seventh instalments of the Ice and Fire series, dubbing the claims "misinformation" and "insanity".

"Why would I sit for years on completed novels? Why would my publishers ever consent to this? They make millions and millions of dollars every time a new Ice & Fire book comes out, as do I."

With a reported net worth of US$80 million, Martin likely doesn't need to take Air New Zealand up on their offer of free flights; but he's yet to respond either way.