for those who book your ticket via a travel agency, an agency provider charge will be applicable. The agency fees the charge as its company cost. Most of the travel agents in Bangladesh charge an amount between BDT 500 https://forums.rivals.com/threads/%F0%9F%93%9E-1-857-346-0204-kuwait-airways-modify-booking-how-to-change-flights-and-dates-efficiently.1154305/