Hello Mounika.

It is not a very big issue of loosing the employee id and registration no.

You can still retrive them in the following ways.

You can contact the JNTUH head office  about retriving your details and one of the simplest way among them is ,

You may have to submit any of the proofs of you working at the JNTUH like the pay slips application form or even the call letter or photohraphs of them.

You can even submit the bank statements you you have received your salary atleast once .