About italki teachers

I'm very dissapoint disappointed about the italki teachers because when you schedule the session they give you hope by agree agreeing to the request. After that they send you a msg saying they have another schedule or another excuses.
I think its better before agree agreeing they have to check their your time and everything before agree agreeing to the student. This causes a problem sometimes you fill like giving up sometimes causes a problem, so you feel like giving up. All the time same excuses same problem.
I'm requeasting requesting all the teachers to be carefull careful with their calenda's calendar's session before accept the session.