Hope that everything proceeds fine with you.
Glad to have met with you on ** Fair last year (或其他時間，據實填寫). Now we're preparing a business trip to India from ** to ** (具體日期段) and would like to visit your company on (拜訪他的日期). May I know if it's available for you? Otherwise, please inform your suggestion. Thank you in advance.
Look forward to your soon reply.
Best Regards
***
(簽名：英文名、公司、地址、聯系方式、網站等)
PS： 如非必要，英文商務郵件不要寫得太長太羅嗦，老外都很簡潔的。 BEC的作文中就要求每篇作文不超過六十字，重在實戰！