. >> reporter: like so many children with autism, 13-year-old gus snowdon has difficulty communicating with others. except for one unusual friend. >> hi. >> hi. >> hello siri. >> hello. >> except the iphone's assistant. last year gus discovered he could have conversations with siri and the two haven't stopped chatting since. >> reporter: what is your most favorite thing to talk to siri about? >> i've always talked to siri about everything. >> he's been a loving child. his desire to connect with people is profound. his ability to connect with people is limited. >> reporter: gus's mom judith says his introduction to siri was by accident. >> i was reading like buzz feed has 21 things to do with your iphone. that was one of those lists, one of those things, ask siri what planes are above your head. gus happened to be doing something else in the world. i said, why would anyone need to know this? he said, so you know who you're waving at mommy. >> 1500. >> did you ever look up in the sky and wonder? >> i do yes. >> his endless questions are frustrating to his mother but not to siri. >> what