Show your commitment here and be honest as possible when you answer. You may say that actually I am looking to make a long term commitment. Yet I will work as long as my
presence is beneficial for your airline and customer as well as mine. And if you know you are going to be relocating to another city in two years you should say so. Plans change, but you want to make sure that you are honest about what can be expected of you. If you plan on it being a long term position say so.