We have just learnt that your company has has been working on a new and exciting advertising campaign for (serivce/product) due for relese at the end of this month. We understand that you have come up with a new and unique campaign.
We would like to make arrangements with you and your team, and to set up an appointment to go over this innovative idea for the purpose of your company applying it our our (service/product).
At your earliest convenience, please call me early next week to arrange a time and date.
Thanking you for your time and assistance in this matter.