can you help me find a train leaving after 20:45 going to norwich ?
user
what day of the week are you traveling ?
assistant
i will be travelling on monday .
user
there are 3 trains . they leave at 21:36 , 22:36 , and 23:36 . can i book 1 for you ?
assistant
can you book it for me and get a reference number ?
user
how many tickets do you need ?
assistant
i am sorry , i just need the arrival time and price , please . that is departing from cambridge , right ?