If you think you can spend anywhere between 40,000 and 60,000 INR (on air tickets, food and accommodation for 3 days), you can select either Singapore or Hong Kong as the preferred location. You would get the interview dates at the earliest. The next option is India. I reckon it isn't a big deal for them to come here and conduct the initial interview.
As per the email, the initial interviews will be arranged in the major cities in which the flights of Cathay Pacific operate, subject to the sufficiency of eligible candidates. Selecting Mumbai or Delhi would be the best option.