i need to find a train leaving cambridge on wednesday .
user
i would be happy to help you find a train . what is your destination ?
assistant
i am looking to go to norwich .
user
i have many trains for you . did you have a departure or arrival time in mind ?
assistant
the train should arrive by 21:30
user
tr7855 will arrive at 20:55 if that works for you
assistant
that sounds goo . can you book for 4 people ?