Hi Suman, 

Welcome to Box Community and glad to assist! 

The email address you've indicated in this post is not registered to Box. This is why he's not receiving the password reset email. 

In this case, I encourage your colleague to setup an account with Box instead. And register for free: https://www.box.com/en-ca/pricing/individual

Thanks for posting! 

Hello, I need help reseting my password for my box account. I made this account as I can't sign in to my work box.com. I am not seeing the reset password emails coming in. Please PM me.  

Thanks!