Restricting customers to be selected from some users

We have a need to prevent accessing customers from some users since some customers hold the critical information. This includes from all modules such as OM, INV, CSI, CSF, OKS etc. We are wondering if there are any option without customization.

Example: 1. User A should be able to see/query the customers C but user B should not be able to see/query customer C

                 2. User B should not be able to create a field service ticket for customer C

                 3. Same for all modules as 1 and 2 above that have customer related field/forms

Thanks,

Ratna