Thanh Du Customer 194217 Le Hong Phong Street Nha Trang, Khanh Hoa 57000 October 21, 2021 Dung Nguyen Manager of Green World 204217 Le Hong Phong Street Nha Trang, Khánh Hòa 57000 Dear Madam Dung I am writing to complain about service quality in Green World hotel I stayed at Green World hotel for 3 days I feel unsatisfied with the service at the hotel First of all, the service in this hotel is not good My room was not cleaned well It appears that the sheets remained unchanged I have a feelin.