I booked flights on KLM through GOTOGATE and before payment it offered the FLEX option. Only available at the time of payment. Flex option offers 1 free change. Pay the difference in fare only. I thought it was a good idea and paid the extra $494. After payment I realized that I made a huge mistake as the airline offers free changes. I immediately phoned Gotogate to cancel but they were not willing to help even though I just made the booking. They just said the Flex option is non-refundable. I requested to speak to a manager who only tried to phone me back 2 days later. I am very upset because they offer the Flex option on a already changeable ticket. What a waste of money. I could have booked the same flights for the same price through the airline and make free changes. Gotogate also only offer 1 free change with the Flex option and will probable charge a service fee thereafter. And terrible customer service. Stay away!