We had booked tickets from Trivandrum to Stockholm by Qatar Air. Found that the flight from Doha to stockholm was operated by Finnair. Tried buying of seats and placing our option of vegetarian food just like QA flight. But nowhere it enabled us to do so. In the flight there was no veg food and so we were given a tray with one small bun, some cut fruits and one cake. We were told they will organize something for us soon. But nothing was done. My wife being diabetic, felt hungry and later asked for something. She was given a muffin which she said she cannot take. She was told there is nothing else. Very disappointing. We used to travel every year by QA and Doha Stockholm flight used to be operated by QA. We were served good veg food and many times snacks, coffee etc. If it is continue to be operated by Finnair we may not travel by QA for this route.