A Flight attendant help me resolve an issue with the passenger behind me who 2 hours into the flight decided that she need me to push my seat upright so she could comfortably have room to hold her cat carrier in her lap. She put her knees into my seat back to push it as far forward as it went. The male crew member was walking by from first class and I asked him to talk to her. He told her t take her knees off the seat back and put the animal under the seat where it belonged and I was able to go back to sleep. Thanks United!