Translation of cernir

I came on time and two hours later I arrived at Tuxla Gutieres. I was always suspicious here and I never knew whom to trust. Somehow I got to the airport a few hours too early but this is better.
Unfortunately, it is a natural and eternal phenomenon of human beings. Whereever people have been, it appeared too. Please let me define racism in my next email to you and please share also your thoughts.
We had coffee, played cards and waited for our guide. We had booked the tour with Handspan, so that we were confident that he would show up. In the end the guide was a 'she' and not a 'he'.