As I understand, phone number is your unique identifier
then take A = Fname, B= Lname, C = Phone in sheet 3 directly from sheet1
Either by simple copy, or with formula
and
then in D1 use nested INDEX and MATCH functions. Should read something like:
match function will find position of your C1 (phone number) in column B in sheet2.
and item from column A in sheet2 (a message) located on the same position (= the same row ) will be returned.
If you expect that some people could nave no matching messages - you can use additional function: IFERROR
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