应用: 携程旅行
任务: 打开携程旅行，预定08-20日香港到伦敦，08-25返回的机票。
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: CLICK
step_id: 4
action: TYPE
type_text: 香港
step_id: 5
action: CLICK
step_id: 6
action: CLICK
step_id: 7
action: CLICK
step_id: 8
action: TYPE
type_text: 伦敦
step_id: 9
action: CLICK
step_id: 10
action: CLICK