No one from LBNL will ever call you asking for your password.

The telephone can be a powerful tool for social engineering, but it's easy not to get trapped by it. Don't ever give out personal, private, or proprietary information (including your password) to someone that calls you, no matter what they claim.

Look out for things like:
"Hi, this is the helpdesk, I need to fix your computer, what's your password?"
"Hi, this is cyber security, there's a problem with your system, what's your password?"
"Hi, this is travel, could you please read me your credit card number?"