It's a scam. You can report the user by contacting our Customer Support or emailing support@fiverr.com with a screenshot. Here’s an easy way to report:
Hover your mouse over the message area, and you’ll see three dots in the top right corner. Click on them, and a pop-up box will appear, as shown in the red-marked area.
For more details, check the discussion here: https://community.fiverr.com/forums/topic/334397-is-it-a-scam/?do=findComment&comment=2082235