Hi Vijubob,

These components are added to salary for their tax breaks. LTA is tax-exempt for 2 years in every block of 4 years beginning from 1986-89, provided you follow the tax-exemption rules. So it is a good tax saving component.
Conveyance Allowance is exempt upto Rs. 800 pm. However, I am not sure whether you could avail of this exemption in a BPO company, because your company provides pick-n-drop facility.

Warm regards,
Patra