To modify an existing booking with International Travel Network, travelers typically need to visit their official website, where they can find specific instructions for making changes. Often, there will be an option for managing bookings directly on the site. This may include options such as changing travel dates, upgrading accommodations, or adding services. It is important for travelers to review the terms and conditions associated with their booking, as some modifications may incur fees or require additional notice. Additionally, if there are limitations due to the specific type of fare or package purchased, those will also need to be taken into account. If any difficulties arise or if travelers prefer assistance, they may find contact information on the website, enabling them to inquire further regarding their specific booking needs. Always ensure to have your booking reference number at hand when attempting to make changes.