On the flight from EWR TO PEK (Sept 22) I was assigned to a seat which did not have a working entertainment system. No other seat was available. I was very unhappy. On the return flight on October 13 from PEK TO JFK I was asked to move to another seat due to a passenger who had a medical problem and needed an aisle seat. I did move. Then I was asked again to move to another different seat due to a passenger who had a headache! I then asked if I could sit at the very rear which had an unoccupied seat.They said that that was for crew. Later I saw a passenger sitting in that last seat. I asked if he was crew. He said that he was just a passenger. I was very unhappy with the disrespectful treatment and lack of concern for myself. I am 75 years old and have severe arthritis. I would appreciate appropriate compensation for the terrible experiences on the flights. In view of the facts, I request a 50% return compensation for the cost of the flights. Thank you. Tel 321.751.0847 Email: [protected]@yahoo.com