i need to leave from cambridge on wednesday . can you help me find a train ?
user
we have several that fit the bill , do you have a destination ?
assistant
i would like to go to ely , and arrive by 17:45 .
user
do you have a time you would like to leave ?
assistant
i want to leave as late as possible and still arrive by 17:45 .
user
i can book you on the tr6745 leaving at 15:50 and arriving at 16:07 .
assistant
that sounds wonderful !