To verify your flight using a PNR (Passenger Name Record), which is a 6-character alphanumeric code often called a "Booking Reference" or "Confirmation Code," you should visit the official website of the airline operating your flight. Look for a section labeled "Manage Booking," "My Trips," or "Check-In." You will need to enter the PNR code and your last name exactly as it appears on your passport. Once logged in, you can verify your flight status, departure times, seat assignments, and meal preferences. It is also highly recommended to use third-party tracking apps like TripIt or FlightAware, which can sync with your email to monitor your PNR for any last-minute gate changes or delays. If the airline website does not recognize your PNR, it may be because you booked through a third-party agency (like Expedia); in that case, verify that you have the "Airline Reference Number" rather than the agency's internal booking ID, as they are often different.