Express your appreciation. I can get you an appointment. Too often, a lack of appreciation is evident once the appointment has been attained. Keep reminding the helper you don't take this type of endorsement for granted. Continue to report your progress during the sales process.
Helpers like to be kept informed and appreciated.
When a helper endorses you for the first time, they may feel some anxiety because they're concerned about their reputation, too. There's nothing worse than recommending someone who doesn't live up to expectations. I have to do a good job for your reputation's sake, too. I realize you didn't have to stick your neck out for me. Train the helper.