<human>: Could you distill the essence of the text into 1-3 sentences?

So, I work in the healthcare field and have been offered an awesome administrative position.  Today I met with the "big boss" and he basically told me he wants me to take the position for the same pay I have now since I am relatively new to my profession, as he put it.  His words were "I was hoping you'd slide into the position at your current salary and then after ninety days we can review your performance."  I don't want to take the job in hopes of *maybe* getting a raise in 90 days.  The job requires significantly more responsibility and flexibility on my part so I was hoping for a decent raise.  He set up a meeting for tomorrow to negotiate my pay since I didn't agree to his offer of a zero increase to my hourly wage.  So, how do I negotiate a fair wage increase tactfully without blowing my chance at the position or underselling myself?
<bot>: Offered a good administrative job.  Boss wants me to take it without a pay raise despite increased responsibilities. Please help me negotiate!