Frankfinn Institute of Air Hostess Training.

You don't need any of these institutes.
Institutes like these wouldn't make much of a difference while you apply for an airline.
Every airline has their own training, and they don't care or give any additional priority if you have been in one of these institutes. Airlines have about 4-7 weeks rigorous training, with highly qualified instructors.
It's simply a lot of money for no good reason, the hype around these institutions are simply ridiculous.
You rather focus on being the perfect candidate for the job, and this can absolutely be done at home. We have the Internet to get all the information in the universe that we need, and trust me, that's all we need.
It is better you don't go for any institute first, attempt some interviews.

For Air Hostess training, FrankFinn is one of the best institutes in India. But if you are looking for course in Hotel Management then SRM is a good option. In SRM, Tourism and Hospitality school provides an opportunity for ambitious students who enjoy working with people. It operates in a highly competitive environment. Students pursuing this course are believed to have a strong business foundation and customer service skills. Good opportunity for students to train in this field. The partner hotels of SRMUS which give industrial exposure are among the best in the industry, where you will have a unique opportunity to gain valuable insights into the critical aspects of organizational behaviour, working culture, time management and scheduling, hospitality and tourism operations and many more technical aspects.