Select value from dropdown without using Select class. Good example.

import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.Keys;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Actions;

public class SelectFromDropDown {
    public static void main(String[] args) {
        WebDriver driver=new FirefoxDriver();
        driver.get("https://makemytrip.com/");
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        driver.findElement(By.xpath("//div//span[2][contains(@class,'flL travelers rght_space room_sec1')]")).click();
        Actions act = new Actions(driver);
        act.sendKeys(Keys.chord(Keys.DOWN,Keys.DOWN)).perform(); //press down key two times to select 3
    }
}