Dear Mr.xx:
Sincerely wish this letter finds you in perfect mood,and hope all's well with you!
Informed your intention to visit,my boss and the entire company are thrilled and more than excited.However,we may probably have to put off the schedule due to some contingencies we are currently handling.
And I personally wish we'll keep in touch,when our affair is done,and I will arrange your visit.
Last and the least,we can meet at Canton fair or XX fair,where our booth site is XXX.
With expectation,looking forward to see you there!
Thanks and regards!
XXX