Yoke Lian

Hi, i would like to check about the earlier trains at Namba station? As I need to reach Kansai airport by 7am. I'm thinking to take the Kansai International airport Limousine Bus from Herbis Osaka(Osaka Sta). So i need to take train from Nambe station to Nishi-Umeda Station . Any other recommendation way to reach Airport by early morning 7am? Thanks!