in that case there is no standard template for this.
RE: Bank Account with
DBS (centralised this)
Dear Sir/Madam,
I, (your name), (passport number), will like to open a bank account
with DBS bank. I am referred by my friend, (insert his/her name),
of (NRIC/Passport number), who has a DBS account currently.
This bank account will be for this (insert reason).
I will appreciate that you can render your kind assistance for this
matter.
Thank you.
Your faithfully,
Signature
(insert your name)
(contact details)