Hello RailFan, welcome to FT!

You may be correct in thinking that you purchased a flight on Lufthansa. I believe that while you purchased your flight through Lufthansa, the flight is actually operated through a codeshare agreement with BMI Regional (which is a British regional airline).

I would try and look up your reservation using the My Bookings section of the Lufthansa website. If you are having problems getting flight information online, I would advise calling Lufthansa or BMI Regional.

You can also try and look at your flight info on the Expedia website.