Hi, this question area is where people help each other with language questions. You would be better to check out the help and/or contact italki support. There's a link to help on the bottom of the main italki page. I found some help here: http://support.italki.com/hc/en-us/articles/206352838-How-do-I-reschedule-a-session- - there may be something in Russian as well. There should be a link to contact them there too.