Vocab unit 4 -complaint (n.):something that you say or write when you are not happy about something (คำบ่น, คำร้องทุกข์)-overbooked (v.):to sell more ticket than you have available (จองตั๋วมากกว่าที่มี) -unacceptable (adj.):wrong and harmful, especially by not reaching usual or accepted standards of behavior, morals, etc (ซึ่งไม่สามารถยอมรับได้)-inconvenience (n.):an annoying problem or situation, especially one that forces you to make an extra effort to do something (ความไม่สะดวก)-satisfaction (n.):the pleasure that you feel when you do / get something that you want (ความพอใจ, การทำให้พึงพอใจ)-approval (n.):a formal or official statement that something is acceptable (การอนุมัติ, การอนุญาต)-couple (n.):things or people of the same type (สองสิ่งที่คล้ายกัน)-outrageous (adj.):very shocking or unreasonable (เหลือทน, รุนแรง)-demand (v.):to say in very firm way that you want something (ต้องการ)-handle (v.):to take action in order to deal with a difficult situation (จัดการ)-resolution (n.):the action of solving a problem or dealing with a disagreement in a satisfactory way (การแก้ปัญหา)-deserve (v.):to have earned or to be given something because of the way you have behaved or the qualities you have (สมควรได้รับ)-acknowledge (v.):to admit, send news that one has received something (ยอมรับ)-downright (adv.):completely or extremely: used for emphasizing how bad someone or something is (โดยสิ้นเชิง, อย่างชัดเจน)-subscriber (n.):people who pay to receive the service (ผู้รับบริการ)