You might *nicely* request a skykit. UAL recently missed a special meal on a flight KOA-LAX and without making a fuss, the purser offered a skykit voucher. It was worth $100 domestic discount or 2x500mile e-certs or 10% off any flight or 8K RDM. I felt that was more than fair and reasonable. As mentioned earlier...not usually the right way to get anything by "demanding" it...
TT