Dear Felix
We are interested in producing and running a television advertisement [TIME PERIOD, ex. during September]. The expected duration is [DURATION, ex. 30 seconds] and we plan to run [X] spots in the [TIME OF DAY, ex. early afternoon period].
I would greatly appreciate it if you would call me at XXX-XX-XX to discuss the services you provide and your advertisement rates.
I look forward to speaking with you.
Regards
Lydia