Can CENVAT be taken on service tax part on flight fare

We (Nature of Company is  Asset Management Company) have hired a travel agent through whom we book tickets for business-related travel of our employees. The tickets issued by the airline companies are in the name of passengers, that is, in the name of our employees who are travelling and not in our firm’s name.Further, the airline does not give us any invoice.

Can we take credit of the service tax paid by us on such air tickets? If yes, on what basis can the credit be availed? 

Thanks & regard

Arun Chhajer