In a domestic violence case where a person filed assault charges, how can it be canceled?

If there hasnt been a warrant issued yet, can the person who filed charges cancel the process? Also can the person who filed for a temp 61 day restraining order cancel the process for restraining order as well? The investigator working on this case does not want to cancel the process although a warrant hasnt been issued yet, he says its up to the DA. How can I get this dismissed if I'm the person that filed the charges and temp restraining order? I no longer feel that its necessary to pursue and right now the case is at the stage where the investigator spoke with me to hear my side, now he's trying to contact the other person to hear their side. Thanks