I would ask if they knew that different areas of the earth have different leaders and if so do they mean the country's leader, the city's leader or some other type of leader. If need be I would explain farther and I would ask them to be more specific. I would suggest that they may want to talk to many different leaders of many different areas of the world.I would explain that in the area of the world I am in my leader is Trump, Congress and the house of representatives but I would suggest that they may want to go to the united nations headquarters and see if they could set them up with a meeting with some world leaders. Then I would google the address to wherever they want to go along with the united nations headquarters, ask if they know where any of those places are and if not is it ok if I ask a friend first to let me borrow their GPS? If they don't know what that is I would explain that it's to help locate a particular area of the world. If they say I can not they have the technology to locate the places on earth on their ship to get me there then I would board the ship and lead the way. If they do let me get the GPS because they don't have that technology then I would get the GPS board the ship and lead the way. Now the reason I make the assumption they may not have the technology is they may know where the earth is and may even know where a few of the places are on earth but I don't know if they know enough about the earth to have it map out on their advance forms of whatever they use to locate places. After all I wouldn't know much about their technology which is probaby more advance then human technology. On the way there, I would ask questions about their politics, explain a little about earth and humans. I would try to gain understanding from them and try to help them understand us so that they may find it easier to talk to said leaders. I would ask why they are there as well and may or may not get much of an explanation. I would warn them that humans may freak out about them. This is all assuming I don't freak out, that the aliens are fluent enough in English, that I'm not hallucinating, that they don't take the way I talk as disrespect,that they are only curious and don't want to enslave humans and that they don't kill me etc...