Calculated Column: IF function

You can use if like

IF(table[Username] = "Adam Thompson","London" ,"ABC") 

But in your case it is better to use switch

https://docs.microsoft.com/en-us/dax/switch-function-dax

https://community.powerbi.com/t5/Report-Server/How-to-use-the-CASE-statement-in-Power-BI/td-p/410864

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