He explained how he pictures her full of life, as she was the last time they met.
"The title would be, "It's [in] very early stages, but we're working on it," Unglert continued.
John will reprise his role as Finn in the next installment of the Star Wars Saga - The Last Jedi - which hits UK cinemas in December.
And just this week the following installment, Episode IX, was given a release date of May 24, 2019.
The BAFTA winner disclosed that Orlando warned him about the perils of dating as a celebrity, advising him to try to find love immediately.
John explained: 'He told me to try and secure the love of my life before all the fame stuff starts.'The star said the start of his dating experience as a celebrity has also not been smooth - despite the fact that he is not immediately recognised by everyone.