i am looking for a train departing from cambridge .
user
hi , there s 1 that departs at 05:00 going to london kings cross . would you like to book it ?
assistant
i actually need to go to birmingham new street by 13:45 on tuesday .
user
the tr8233 arrives at birmingham new street at 13:44 . would you like me to book you a seat ?
assistant
please , just 1 ticket . can i have the reference number as well ?