Amadeus interview questions

The interviewer just scanned through my resume, asked me a couple of questions on design pattern, that's it. Then he went to search for someone to take my next round. After sometime came and told me HR will give a call. Next i know i am not shortlisted for second round.

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.