When trying to set up a samba user, you set the password using
smbpasswd pratap
You are prompted for the new password but then it gives the error
Failed to find entry for user
This has happened because it is the first time you have set the password. You need to add the user first, so the command should be
smbpasswd -a pratap
First create the user in the normal way you would create a regular user, i.e;
# useradd user1
Then add the user as a samba user now
# smbpasswd -a user1
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