In Hollywood movies the taxi drivers will have random conversations with passengers to advance the plot. In real life, the purpose of this conversation is for the driver to learn where his next fares might come from. Sometimes the passenger will figure out what you're trying to do and will offer you valuable information. No reason not to. It's a win-win.
Not all drivers do this. Some companies hand out jobs to the next driver waiting in a queue so everything is fair and equal. Some drivers prefer this system. But this produces poor customer service because that queue of drivers might be on the other side of town, and the fare will be waiting a long time. I never quite understood that mentality. I never worked the airport because the airport does not reward hard work. It's just a dumb queue and the fares are unpredictable. Not profitable enough for me.