i need a train going to cambridge that leaves after 14:45 .
user
where are you coming from ?
assistant
i want a train department from cambridge and going to birmingham new street on friday at 14:45 .
user
i can put you on the tr8842 it leaves at 15:17 how many tickets please
assistant
2 tickets please .
user
there is an error in that train booking could i book the tr2519 from cambridge to birmingham new street , on friday , departing at 15:01 ?
assistant
yes , that would be great . i would like to book 2 tickets and i'll need a reference number , please ?