This scammer has no idea what my surname is, nor does he or she know what your surname is.  S/he is hoping, though, that you will believe this ridiculous story and start sending money.

How are you today? I am Mrs Isabella, I am regional manager here in
Dakar, Senegal. I am writing this letter to you because of your
surname. I have been in search of someone with your last name, so when
I saw your name I decided to contact you for this opportunity and hope
we can work together.

Get back to me ASAP