应用: 飞猪
任务: 打开飞猪，进入机票频道，设置‘天津-昆明’，日期分别为6.20日低价提醒
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: CLICK