i am looking for a train going to cambridge after 12:15
user
where will you be departing from and what time do you want to arrive in cambridge ?
assistant
i will be leaving on sunday from london liverpool street . i just need to leave after 12:15 .
user
the train closest to the time when you can depart leaves london liverpool street on sunday that 13:39 . would you like to book it ?
assistant
what is the price ? i would like to book .