Two scripts that respect everyone's time
The benchmark line: "Your open rate is [X]. The comparable kits on my desk put my ceiling for this audience at [Y] CPM against audited circulation. What can you do on rate or added value to get us there?"
The standby line: "We are flexible on timing. If a page opens up near close, what does that inventory look like for us? We can have materials ready in 48 hours."
The first uses your kit library and the AAM statement[2] as leverage. The second signals you understand their inventory problem, and sets up Step 04.