Dear Anna,
We appreciate the opportunity to answer your question. When you book your reservation online, you will be asked to select a seat basis your preference (Window, Middle or Aisle). Once the booking is complete the system will automatically assign seats basis your preference provided the airlines offers & accepts advance seating assignment. In case, the airlines doesnt offer or accepts advance seating assignment, you will need to call us i., e the travel agency or the airlines directly to request a preferred seat. Please keep in mind that the airlines may charge for certain select seats. For more information, you may call and speak with one of our travel advisor on 1-855-282-6507