How to handle a complicated with application with frames and dynamic elements

Complicated app

using System;
using OpenQA.Selenium;
using OpenQA.Selenium.Firefox;
using OpenQA.Selenium.Support.UI;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            var desiredString = "Courtland Street Northeast, Atlanta, GA, United States";
            var driver = new FirefoxDriver();
            driver.Url = "https://booking.supershuttle.com/?RezMode=0&A=&GC=&direction=T&port=ATL&WC=0&Lng=en-US";
            driver.Navigate().GoToUrl(driver.Url);

            //Default timeout for element
            try
            {
                driver.FindElementById("airport-pickup-address").SendKeys("Hilton Atlanta");
            }
            catch (UnhandledAlertException e)
            {
                var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(5));
                wait.Until(ExpectedConditions.FrameToBeAvailableAndSwitchToIt(By.Id("ve-chat-iframe")));
                var closeButton = wait.Until(ExpectedConditions.ElementIsVisible(By.ClassName("close-button")));
                if(closeButton != null)
                    closeButton.Click();
                driver.SwitchTo().DefaultContent();
                driver.FindElementById("airport-pickup-address").SendKeys("Hilton Atlanta");
                var elements2 = driver.FindElementsByXPath("//*[@class='pac-item']/span[3]");
                foreach (var option in elements2)
                {
                    if (!option.Text.Contains(desiredString)) continue;
                    option.Click();
                    return;
                }
            }
            finally
            {
                driver.Close();
                driver.Quit();
            }
        }
    }
}