Not to use Concatenation please as surname may be incorrectly input as first name.

Thanks.

Hi @Sonny Yuan​ ,

1. Use the Loop get the data from A or B Column values stored into the variable
2. Use If conditions, A column value is matched with input value get the B column value, If not matched then skip loop the next values.

Above case, you're using the First name, so use the B column value is matched with input value then get the A column value, Also check the A column value after the matched.

in Step1 - what type of variable you would recommend to use please.

Thanks.

~@Tamil Arasu​  Thanks Tamil. The solution is what I after.

No problem!