Taking a skyline photo with a person closer to the camera during night time

How can I take a photo which shows the skyline and the person who is standing around six feet away from the camera with proper lighting at night?

For taking just the skyline I’ve used long shutter speed and it turned out great, but when including a person on it, the person becomes blurry because it’s impossible for a person to remain static for that long.

Ps. I do have two flashes, 35mm prime lens as well as 18-300mm zoom lenses as well. The camera I use is Nikon D7200.