Emirates Airlines has a flexible flight change policy that allows you to change your flight without paying a change fee if you do so within 24 hours of booking. If you change your flight after 24 hours, you will be charged a emirates change flight fee. The amount of the change fee will vary depending on the fare class of your ticket.
In addition to the change fee, you may also be required to pay the difference in fare between your original ticket and the new ticket. For example, if you book a ticket for $100 and then change it to a ticket that costs $150, you will be required to pay the $50 difference in fare.