Assertiveness in Sales and Customer Service Examples

You can assertiveness in sales and customer services:
Beliefs: assertive behavior is I'm alright, you're alright

Assertiveness in Sales
Customer Service Examples

Emotions: accepting, acknowledging, persuasive, empathetic and/or neutral emotions and feelings
Actions: body language, gestures, eye contact.
Thoughts: very similar to beliefs. You've set of thoughts about the prospect/customer before selling or during customer service