Let's take two situations as an example.
A person comes to the company, pays money, and wants to receive a certain service. The employee helps with their question in good faith, but at the same time answers dryly and officially. Despite the fact that the customer receives in full what they paid for, a slight feeling of dissatisfaction might still remain. A very slight feeling they may not even be aware of.
Another time, the customer comes for the desired service again, and in addition to it, they get a relaxed and pleasant chit-chat with an employee. Seems like such a trifle, but it can well charge positive energy for the whole day.
Similar situations are observed in online customer service. It happens a little differently, but the customer, reading the response of the employee, also experiences some feelings. Therefore, the form and manner of communication are very important.
No matter how paradoxical it may sound, the most important thing is how your answer caused the customer to feel because it is emotions, and not words, that will remain in memory.