It's not just what you say; it's how you say it. In fact, I'd go as far to say that what you say matters a lot less than how you're perceived, especially in sales.
You have to exude confidence and calmness when calling on prospects.
Because, if you don't, they'll pick up on it, and you won't be seen as trusted and valued.
If you can master eye contact (including eyebrow gestures), facial expressions, torso and arms behaviour, and leg activity, you'll be on your way to a successful appointment.