Amadeus Business Analyst interview questions

It was two prong approach. First I got a call from the HR asking , the routine questions (NP, CTC, ECTC etc.) Then The next day I received an email from the HR asking me to attend F2F round. I gave two round of interviews , The interviewers were very courteous and polite. They emphasised mostly on my experience and some general questions. Both the interviewers seemed quite impressed , but as it turns out they were just putting up their game face since I didn't got the job. Not sure what went wrong?

4 interview round. 3 technical and 1 HR. Interview was not too difficult but situation based questions were asked. Interview process was pretty time consuming had to wait for over 5 hours to complete the process.