To dream of any religious figure means that you are looking for spiritual guidance. You are trying to understand the meaning of life, God and what it give to you. The Krishna could also indicate the guider of your waking life, who helps you going through days. If you see Krishna talking to you, you already found your inner peace, there is no need to look deeper into it. If you are very religious person, it is completely normal dreaming of Krishna.
Read more about dreaming of Krishna in other dream meanings interpretations.