AN MLG ACR FLC FAILS TO MAKE THEIR ALT XING RESTR 35 MI E OF OXI; IN.

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I WAS THE PF ON FLT FROM ALLENTOWN; PA; TO CHICAGO; IL. WE WERE ABOUT TO BEGIN OUR DSCNT INTO THE CHICAGO AREA WHEN A FLT ATTENDANT KNOCKED ON THE COCKPIT DOOR TO PICK UP OUR BREAKFAST TRAYS. UPON ENTERING THE COCKPIT; THE FLT ATTENDANT ASKED THE CAPT AND MYSELF ABOUT POSSIBLE RECOMMENDATIONS TO PURSUING AN AVIATION CAREER; WHICH HER SON WAS INTERESTED. DURING THE CONVERSATION; WHICH WE ALL 3 PARTICIPATED IN; THE CTR CTLR TOLD US TO CROSS 35 MI E OF KNOX AT FL250. THIS WAS READ BACK TO HIM; AND A QUICK CALCULATION SHOWED THAT WE HAD ABOUT 25 MI TO GO BEFORE NEEDING TO START DOWN. THE CONVERSATION WITH THE FLT ATTENDANT CONTINUED AND THEN CONCLUDED. AT THE CONCLUSION OF OUR CONVERSATION; I THEN PROCEEDED TO BRIEF THE APCH THAT WOULD BE USED AT ORD; AND TOTALLY FORGOT ABOUT THE ASSIGNED XING RESTR. AT 35 DME FROM KNOW THE CTR CTLR ASKED US WHAT OUR ALT WAS AND AT THAT POINT THE CAPT AND I BOTH REALIZED I MISSED THE XING AND IMMEDIATELY ASKED FOR RELIEF. THE CTLR GAVE US ANOTHER FREQ AND ADDED THAT IF THE NEXT GUY GIVES US A XING RESTR; WE MAY WANT TO ADHERE TO IT. TO OUR KNOWLEDGE; THERE WAS NO TFC CONFLICT AS INDICATED BY OUR TCASII OR BY THE CTR CTLR HIMSELF. AT ANY RATE; AS THE PF; IT WAS MY RESPONSIBILITY TO ASSURE ADHERENCE TO THE CLRNC RECEIVED. I BELIEVE THAT JUST LIKE IN ANY EMER; IF THERE IS ANY DISTR WITHIN THE COCKPIT (IE; FLT ATTENDANT COM; ETC); THAT THE PF SHOULD PAY ATTN TO NOTHING BUT FLYING THE AIRPLANE. IF HE/SHE WANTS TO JOIN IN OR ADD TO A CONVERSATION; HE/SHE SHOULD ASSIGN THE FLYING DUTIES TO THE PNF. SOMEONE HAS TO BE KEEPING TRACK OF THE FLYING AND THE ASSOCIATED ATC CLRNCS RECEIVED AND THIS I WAS SUPPOSED TO DO.