4. The system according to claim 3 , wherein the processor is further configured to perform: providing an opportunity to the other at least one other provider to offer second biddings; receiving at least one second bidding from the at least one other provider; presenting, in the online conversation, the at least one first bidding and the at least one second bidding from the at least one provider and the at least one second bidding from the at least one other provider who offered the at least one second bidding.
3. The system according to claim 1 , wherein the processor is further configured to perform: receiving at least one second bidding from the at least one provider; notifying at least one other provider that the at least one provider offered the at least one second bidding, the at least one notified other provider not including the at least one provider.