1999 Honda Civic Ex MasterKey

Hi

Recently i brought a used 1999 honda civic Ex from some private party.
It has all the power options as a standard equipment. but it doesn't
has the master key of the car and i have only the valvet key..
with this valvet key i couldn't able to open car trunk from outside.

i dont have any key code for this master key..

Could you please advice me how to get the master key(duplicate) for
this 1999 honda civic Ex.. Is there any chance to get that from any
Honda Dealer?

Appreciate your help.......