To reach/speak to a live person at KLM Customer Service for 24 hour support, call their 24/7 hotline (1-844-643-2807) or 1-800-KLM (1-800-618-0104). You can also use the live chat feature on their website or reach out to them via email. https://www.devex.com/people/how-do-i-contact-klm-airlines-custome-service-live-support-2487571