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.
Dream dictionary: krishna dream meanings
To have interaction with Krishna in the dream is interpreted as a symbol of spirituality, wisdom and intelligence. To see Krishna, when you are dreaming, has deep meaning and stands as an omen for divine love, desire and passion and spiritual knowledge.
To see Krishna in your dreams, denotes that your greatest joy will be in pursuit of occult knowledge, and you will school yourself to the taunts of friends, and cultivate a philosophical bearing toward life and sorrow.