==== customer service india ====
  * 1800 1233901

Ref:
  * https://www.etihadguest.com/en/contact-us.html

==== classes in economy category ====
  * Basic, Value, Comfort, Deluxe

  * If you book a ticket in the comfort class, you will be able to select some seats for free.
  * If you book a ticket in the value class, you will have to pay to select the seats beforehand.