 Complete the following phrase:  In 2013 Yui was assigned as backup Flight Engineer for Italian astronaut Samantha Cristoforetti for ISS Expedition 4243. Cristoforetti launched onboard Soyuz TMA-15M alongside fellow Expedition 4243 crewmembers Anton Shkaplerov and Terry Virts 23 November 2014, following which Yui began training as prime crew Flight Engineer for ISS Expedition 44 