1) Put the onion, carrots, celery, thyme, parsley, chicken broth, and water in a medium pot. Season with salt and pepper, to taste, and bring to a simmer over medium high heat. Simmer until the vegetables are almost tender, about five minutes.
2) Add the noodles and cook until tender, five to eight minutes (depending upon the size of the noodles). Add the chicken, warm through, and then adjust the seasoning, if necessary, with salt and pepper. Serve garnished with parsley and dill.