... showing his interest ...
O'Boy ...
I'm not sure exactly what you mean by "showing his interest". Do you mean "acting interested during the interview"? (Its'a genuine question...not taking the p*** or anything....)
Enthusiasm is always desired in an interview. It doesn't mean OTT-type enthusiasm, but just a genuine interest in the company, the position, a positive attitude towards learning, and similar concepts.
Generally speaking, however, what an airline looks at first is your total experience. This will include licenses, ratings and total hours flown (with a breakdown also of PIC, turbine, etc.). Any experience on their type is usually greatly appreciated, but often not required, because they can/will usually provide their own training on the given type.
Each company may have slightly different application requirements. And while you may meet their minimum requirements, they may have many, many, other applicants who have more total time, or more PIC time.
For instance, if you have 1200 hours Total time, with 500 hours on the specific type that they fly, you may not get chosen if your fellow applicants have 3000 hours Total time, (with lots of PIC/Turbine time), and no hours on the specific type.
"Timing" is also another factor. Unfortunately, in these difficult times, there are hundreds of furloughed ("made redundant, temporarily") pilots with thousands of hours and years of experience, looking for jobs. It's not to say that you can't find a job, but just realize that the competition is currently very high.
Hope this helps.