Why no tour in early Oct ?

Oh my! I received a phone called from the tour agency in the morning and was informed my Switzerland + Paris trip had to be cancelled due to low response. I thought of hopping over to another another travel agency, but unfortunately, they also cannot form the trip to Swiss.

However, there were tours formed 1 week before and after. Why is it so? I don't understand. Is it because it was the exam period? School holiday? Public holiday? I can't find any reason. I have blocked 2 weeks of leave and have been looking forward to this beautiful Swiss. And now my tour has been cancelled, I have to find other places to visit. Haiz. Such a disappointment.