Be keen, show interest in the subject, learn what they operate before hand, show dilligence and safety.....
If you can show some knowlege in basics, how an engine works, aircraft flies etc
and if they operate a fleet of say 737's and they say were will you see yourself in 5 years, don't say working on 747's.... tell them you wish to progress with the company and want to attain your licences and grow with them.