The most appropriate response would be to acknowledge the co-worker's inquiry while redirecting the customer to someone else for assistance. This demonstrates a collaborative and supportive work environment. By introducing John, the new employee, you not only maintain the flow of customer service but also help your coworker engage socially with the new team member, promoting teamwork and inclusion.
This approach can enhance the customer experience by ensuring they receive the help they need while also preventing any disruption in the current interaction. It reflects a positive attitude and engagement with team dynamics, which is crucial in a job skills training context where collaboration is often highlighted as a key competency.
While the other responses might reflect how one might feel, they do not foster an environment conducive to teamwork and effective customer service. Being too direct or dismissive in a customer service situation can negatively impact morale and customer satisfaction.