This almost always works:
Objective One - get an appointment with CP.
1. Find out who the managing director or CEO is. Learn as much as you can about the company and its operations.
2. Ring CEO or Managing Director and ask for them by name. You get past reception by stating that you want to talk to him about charter work. When connected, state who you are and that you are a pilot who believes he may have something to contribute to the company's operations. Be as specific as you can.
You will most likely be asked to talk to the CP/CFI.
3. Ring CP/CFI. Ask for them by name. State truthfully "Mr. so and so asked me to ring you". State your case and ask for an appointment. Since you have been referred from above, the CP probably doesn't know who you are, but he knows the boss wants you to talk to this guy. He doesn't know you cold called his boss. You will probably get your appointment. Bring your resume.
4. The rest is up to you.
P.S. It's easier for girls, you will always at least get the appointment.