Migration to a new MacBook Air failed

Hello anyone,

I used Migration Assistant to move the files from my old MacBook to a new MacBook Air and after 6 hours it got stuck and it kept showing '4 minutes left' with nothing happening for over an hour and a half so I stopped the process with the intention to restart it later. Now I am trying to access the new MacBook Air but it doesn't recognize the password and locked me out for too many attempts, the password is definitely the proper one (the same one as the old Mac as it shows me the same old hint) , not sure how to proceed now. Can you please help as it is getting rather frustrating.

Thanks, Adel