将以下句子翻译成英文：我昨天在公园散步时遇到了我的老朋友。输出格式要求：1. 四个要点；2. 每个要点一句话；3. 以json格式输出。
user
{
  "point1": "I went for a walk in the park yesterday.",
  "point2": "During my walk, I met an old friend of mine.",
  "point3": "We hadn't seen each other for a long time.",
  "point4": "It was a pleasant surprise to run into him/her."
}
assistant