hi , i am looking for a train from cambridge that arrives by 17:45 .
user
where will you be going ?
assistant
going to london liverpool street from cambridge . i need to arrive by 17:45 .
user
what do and time and do want to leave ?
assistant
i would like to arrive by 17:45
user
tr5154 leaves at 05: 59 should i book it for you ?
assistant
how long is the trip on the tr5154 ?