Dear Jim,
Good afternoon! I hope all is well.
I have received your [e-mail? letters? not "mails"] with pleasure, and am so sorry for not replying sooner. In the time since we met, we've been terribly busy.
We are planning to visit Canada in the coming months [be more specific: In early February, in late March...], and I hope to meet with you there to discuss how we may be able to work together.
I look foward to hearing from you and to the prospect of a fruitful cooperative venture.
Best Regards,
-- Do you want him to do anything in the period of time between now and when you see each other in person? Are you supposed to send him anything to provide more information on your business?