https://support.google.com/admanager/thread/307552447/%F0%9D%9F%AD-%F0%9D%9F%B4%F0%9D%9F%B1%F0%9D%9F%B1-%F0%9D%9F%A0%F0%9D%9F%9B%F0%9D%9F%A0-%EF%BC%94%EF%BC%99%EF%BC%98%EF%BC%92-what-is-the-cancellation-policy-of-singapore-airlines-customerservice
https://support.google.com/admanager/thread/307552447/%F0%9D%9F%AD-%F0%9D%9F%B4%F0%9D%9F%B1%F0%9D%9F%B1-%F0%9D%9F%A0%F0%9D%9F%9B%F0%9D%9F%A0-%EF%BC%94%EF%BC%99%EF%BC%98%EF%BC%92-what-is-the-cancellation-policy-of-singapore-airlines-customerservice