You can configure a custom bot or a feedback bot that prompts your end-users to rate your customer service on a scale of 1-5 stars, where 5 is the most favorable and 1 is the least favorable.
★★★★★ — Loved it
★★★★☆ — Liked it
★★★☆☆ — It was okay
★★☆☆☆ — Disliked it
★☆☆☆☆ — Hated it
The system-default rating labels are as cited above. However, you can set different rating labels by clicking Custom, deleting the default labels, and entering the rating labels that you prefer.