You need to do degree or diploma course in hospital and tourism management. You can pursue graduation course in aviation field. You should have a great command in your English speaking skills.You also need to work on your personality well as you will need the same for your interview rounds.

Refer to the website below for more detailed information...

https://hospitality.careers360.com/articles/air-hostess-training-courses-in-india-eligibility-admission-jobs

I hope my answer helps. All the very best for your future endeavors!