Please correct this

Hi. Please correct this. I want to say that I maintained the underlined part in past tenses since I felt it would be correct (OK?) and didn't have to be in past perfect tenses.

About a month ago, I met a school friend I hadn't seen for about twelve years. It was a sentimental, as well as totally unexpected, encounter. We were at a large market that is known for size and its ability to stock fresh products and produce periodically. There we were, in one of the isles -- I was looking for a cereal and he was glancing up and down the shelves for jam. Then, in one surprising moment, our eyes met and we then started to rehash our old memories back in time. We exchanged our numbers. Many days were passed since then. Then, suddenly, I got a call from him asking me why I hadn't shown up at the meeting. Surprised, I told him that I didn't have the prior knowledge of the meeting. I told him had I had a prior knowledge of the meeting, I would have tried hard to be there. He then mentioned something about leaving telephone messages to a man named John Doe, but it was strange since I had no body in my house named John Doe who could have gotten the call. There was a lot of mystery yet no answers.