Merging 2 slices from a method into a map

Question

I have a function that returns 2 variables in a form of slices and I want to merge the two slices into a map as key-value pairs. The issue is that can't find a way to iterate through each slice separately and add them as a key and a value. The current implementation is iterating through all the prices and it's adding every price to the town key.

package main

import (
    "fmt"
    "math/rand"
    "time"
)

func main() {
    cities, prices := citiesAndPrices()
    towns := groupSlices(cities, prices)
    for cities := range towns {

        fmt.Println(cities, prices)
    }

}

func citiesAndPrices() ([]string, []int) {
    rand.Seed(time.Now().UnixMilli())
    cityChoices := []string{"Berlin", "Moscow", "Chicago", "Tokyo", "London"}
    dataPointCount := 100
    cities := make([]string, dataPointCount)
    for i := range cities {
        cities[i] = cityChoices[rand.Intn(len(cityChoices))]
    }
    prices := make([]int, dataPointCount) 
    for i := range prices {
        prices[i] = rand.Intn(100)
    }
    return cities, prices
}

func groupSlices([]string, []int) map[string]int {
    cities, prices := citiesAndPrices()
    towns := make(map[string]int)
    for _, cities := range cities {
        for _, prices := range prices {
            towns[cities] = prices
            break
        }
    }
    return towns
}