Provide the theme summaries for the following conversation: 

Jamie: Anyone travelling from Edinburgh to London in the next 24h? Friends need a document taken up for their wedding!!!
Kelly: i am.. Next week
Jamie: too late! They need it urgently! xx
Rob: what about recorded delivery fast track?
Jamie: can cost quite a bit?!
Rob: but could be delivered within 24h!
Oliver: my sis is going. Can ask her!
Jamie: cheers mate! I’d appreciate that!

Summary: 
Oliver's sister is travelling from Edinburgh to London in the next 24 hours so she might be able to deliver an important document.