Rescheduling your flight on Lufthansa is simple. Visit the official Lufthansa website or mobile app 1-855-546-5044, and navigate to the "My Bookings" section. Enter your booking details to find your flight. From there, you can choose the option to modify your flight date and time. For assistance, call Lufthansa customer service at 1-855-546-5044. If you face issues while rescheduling, contact Lufthansa at 1-855-546-5044. Lufthansa representatives at 1-855-546-5044 are available to guide you through the process.