Dear Mr. Martin,
It has been a long time since we met last time. Is that because of your unsatisfication with our services? If so, please give us your precious comments so we can get improved. We would like to see you again soon.
自从上次见你后已经很久了.那是因为你对我们的服务不满意的关系吗?假使如此,请提供你宝贵的意见让我们改进.我们期待很快可以再见到你.