To service its consumers, the crew is available by phone 24 hours a day, seven days a week. Simply look up the local hotline number, phone it, and give him your itinerary. Because the airline cherishes your privacy, no information provided over the phone will be shared. Relax by finding the most affordable flight tickets for your next family holiday.

See: https://www.airlinesadviser.com/blog/how-can-i-make-lufthansa-rebooking/