In the System Desing Round, asked me to design the customer service system.
These are the three ways customer can reach the customer service exicutive.

1. Email
2. Phone
3. Chat

There will be around 1 Million Request per day
so, how to design a system which has low wait time? can address the customer at the earliest? How to root the customer to the right Customer Service Executive ?
What is the backend components required to handled this sytem.

Considering the Phone & Chat Vloume is hight compared to Email.