Skyfire would indulge his curiosity a bit, but only so far.

"I was exploring a planet, carrying experimental projects, while also collecting samples and crashed. Things got mixed up, wires got crossed and my formatting got messed up while the scans were trying to find something to model me after so I could survive... At least that's the short version."

He shrugs a bit "I'm not going to get into the long version..." That was a touch personal for having just met someone after all... but Skyfire's explanation may catch Han's attention in that it does sort of hint that Skyfire is likely not as... organic as he seems.