I am trying to book a plane ticket with Cathay Pacific Airlines. I am Spanish so I have one name and two last names. When I try to introduce the information in the webpage of the airline I can't use spaces in the "Surname" field so I can either put just the first one of them or both of them without any separation.
What should I do? I'm leaning towards the second option but I don't know if I would have any problems. I have also contacted the airline because I couldn't find any information in their web.