Better would be;
"Steven Burke from XYZ Finance Company, this is an urgent financial matter, so if you can provide his/her cell phone number that would save valuable time!"
However, no matter the quality of the list or how good you are or how hard you work, ultimately, you are never going to achieve 12 appointments on average per day. You may do it occasionally but not consistently, this just appears to be an unrealistic expectation by either you, your company or both.
yes, list quality, hard work and skill will make a difference ... 12 is just to many.
Good luck.