hi , i need a train leaving cambridge after 14:30 .
user
there is a train leaving cambridge for birmingham new street on friday at 15:01 for 75.10 pounds . the trip will take 163 minutes .
assistant
excellent . can you assist me in booking a ticket ?
user
certainly . your reference number is kpfta841 .
assistant
wait . . i did not specify how many people . can i cancel kpfta841 ?