If you want to chat with anyone in Facebook messenger you need to send friend request and they need to accept then their name will come in chat list. Then we can chat with them.
To get rid of this we have a wonderful solution.
With this we can add friends from messenger instantly.
Facebook messenger have an option named "Scan code”.
For this go to your profile. Click on your profile pic which will have special code.
It will have two options "scan code" and "My code" just scan your friend’s code.
Instantly they will be added to list.