UK’s Withdrawal from the EU

I have listened very carefully to just every debate on this topic, and I understand that the European Union would give an extension only if it thought there was a reasonableness behind the request; I can perfectly understand that. Will my right hon. Friend tell me what rationale we would give to ask for this very short and limited extension, given that the House will have already rejected the newly negotiated deal? I cannot think what else could happen in those couple of months that would be helpful.