"As a PSE mail processing clerk, I know part of my duties would be working the service window and selling products and services to customers. To provide the best service possible, I will need to be knowledgeable of all of those products and services, which would be my priority from day one. The other key component would be providing service with a smile, no matter how busy my day was. Putting the customer as the top priority would always be job one."

The key to providing a great answer to this question will be the research you do before your interview. Read through the job description of the job you are interviewing for and figure out how you will be interacting with USPS customers, either directly or indirectly. Then, talk about the positive aspects of service you can bring to the job every day. If you've held any direct customer-facing roles in the past, talk about your role and the positive interactions you've had to prove your ability to bring this service to the job you are being considered for.

"Mail handler assistants provide a key service for all USPS customers, even though they may not work face to face with them. Providing great service will come down to being accurate in mail sorting at all times. I have always prioritized being attentive to my work, and you can feel confident in my ability to do so."