getting value of a coulmn subjected that it is filtered using three filters

Question

I am in need to get the value of a cell in column subjected that it fulfill the requirement of equality between three coulmn values

df_users header USER_NAME PhoneNumber CabinetTECode ShelfNumber PeeringPointDescription InterfaceDesc AdditionalInfo CVLAN TESVLAN

while df1 header Timestamp Message username int bras ae svlan cvlan

i need to filter using svlan then cvlan then ae by which df_users header TESVLAN,CVLAN,InterfaceDesc respectively and return the value of corresponding USER_NAME

i tried several times but all gives error

please support

for df_users

for d1

i want to check last three columns on df1 presence on df_users and return the corresponding value of USER_NAME