Tds on air tickets

Hi, 
Can you please help me out!! My situation:
1. Client: Pvt Ltd. co.
2. Tour agent is booking ticket on behalf of our client and charging Processing Charges from our client.
3. The Processing Charges is in nature of commission; it varies with change in ticket amount.
4. The Processing Charges is separately charged and shown in invoice over the ticket charges. 

Now do my client need to deduct tds on this amount under section 194C or 194H?