i am looking for train going to cambridge please .
user
where are you planning to depart from ?
assistant
i would like to leave from the birmingham new street station please . on a saturday .
user
okay , what time do you need to leave by ?
assistant
i need to arrive by 16:45 , departure is not as important .
user
how about tr3415 that arrives at 08:23 ?
assistant
you can book it please . get me the reference number too
user
reference number is : pa6l738y .
assistant
thank you for your help