Boeing’s Starliner astronauts speak publicly today for 1st time in 2 months: Watch it live

Another mission change example was the crew abort during Soyuz MS-10 to ISS 2018.
A few minutes after liftoff, the craft went into contingency abort due to a booster failure and had to return to Earth. By the time the contingency abort was declared, the launch escape system (LES) tower had already been ejected and the capsule was pulled away from the rocket using the solid rocket jettison motors on the capsule fairing.[5] Both crew members, Roscosmos cosmonaut Aleksey Ovchinin and NASA astronaut Nick Hague, were recovered in good health.
https://en.wikipedia.org/wiki/Soyuz_MS-10