I bought an Apple Watch and I was trying to pair it and the peospn I bought it from I guess hasn’t deleted it from their account. Is there anyway I can reset it so I can pair it with my phone? The Apple Watch I bought, the serial is FHLRJ38WGR7N
You seem to be describing activation lock, which you cannot break without the previous owner's Apple ID and password. The best thing to do will be to contact the previous owner and see if they can remove it. You can read more about Activation Lock on an Apple Watch as well as about what you can do when it happens here: About Activation Lock on your Apple Watch - Apple Support
You'll have to return it if you can. If you can't then you've just made a bad deal... :/
See this article for more information: Turn off Find My iPhone Activation Lock - Apple Support
What would I have to do if I am not able to get ahold of the person I bought it from?
Pairing an iwatch with a new phone
