There are certain key points that a service provider should always keep in mind while communicating with their customers. Those points are explained in the below mentioned explanation part of the answer.
Explanation:
Create the best first impression with their customers by greeting them with great lines.
Always stay polite and kind throughout the conversation.
Listen patiently and address each of their doubts in an easy and understandable way possible.
Do not waste time in any sort of random gossip as that might irritate the customers.
Most importantly always stay positive throughout the conversation as this might create a great impact.
