i'm using the lastest version,my prolem is requester name field. how can i make it populate like select approve

ex: my user name is "005 London"

if i type london in requester name field "London" it don't show, just show when i type 005 

but in select approver if i type "London" it also show 005 London.

i know near requester name field have button search request but that take more time, so any script or how to make requester name field same select approver ?

Thanks