Kumail Nanjiani was "truly mortified" after canceling on Conan at the last minute, forcing Conan O'Brien to improvise and interview his assistant

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Conan O'Brien's new one-guest-per-episode policy finally backfired as his late-night talk show had nobody to interview after Nanjiani canceled 30 minutes before taping. Nanjiani -- who appeared on Watch What Happens Live and Jimmy Kimmel Live! the previous night -- had to cancel at the last minute due to a "snafu" in Silicon Valley's shooting schedule. Conan ended up interviewing Sona Movsesian, his assistant of 10 years and his Conan Needs a Friend podcast co-host. Meanwhile, Nanjiani tweeted this morning of his cancelation: " @ConanOBrien is my comedy hero. Him and @AndyRichter are the reason I started comedy. So this clip is something I would love if it was about anybody other than me. But it’s about me, so I’m truly mortified."