Our Schedule in May has been full, and we have to make it in next month. In addition, it's not necessary for you to accompy us. Your assistant is OK.
We have already arranged full schedule in May,so apponitment just can be made in June,and you do not need come in person,it will be ok for us to have a visit under your staff"accompany.
Our scedule of May is full, so it has to be arranged in June. What's more,you don't need to come in person. You can just send your subordinate to show us around.
Our schedule of May is full, so it must be set at June. And you needn't come personally; designating a subordinate to accompany us is just OK.
May schedule have full, earliest only in June, you do not need to visit personally, you can assign others to accompany us to visit.