Hey as per my idea you are asking about union national bank as there is no such Union Commercial Bank and here I am giving you its details

Services offered
Consultation, liaison and market investigation in Gulf Region market.
Providing market information, consultation and liaison to Gulf Region industries willing to establish business relationship in India.
Developing correspondent relationship with banks in Gulf Region for Trade facilitation.
Assisting Indian and Gulf Region entrepreneurs in setting up offices and Joint Ventures in Gulf Region and India respectively.
Providing information support to Gulf Region business entrepreneurs to set up business relationship with Indian counter parts.

Here I am giving you process of branch locator
Go to official website of Union national bank
After that at top of the home page you will get contact
Under that select branch contact details
Select branch



Address
Union national bank
Abu Dhabi
UNB Building, Salam Street, P. O. Box 3865,
Tel: 02-674 1600, Swift code: unbeaeaa
Feedback Fax: 02-6747120