i need a train going into cambridge , arriving by 17:45 .
user
where are you departing from and what day are you travelling on ?
assistant
i am leaving from bishops stortford on sunday .
user
and what time would you like to leave ?
assistant
i would prefer to leave at 15:00 .
user
the tr4651 train leaves bishops stortford at 15:29 . would you like me to book you a seat on it ?
assistant
does it arrive in cambridge by 17:45 . that is the most important thing .
user
yes , it does .
assistant
what is the price for the train ticket ?