i am looking for a train leaving on sunday that is going to cambridge .
user
there are 200 trains coming to cambridge on sunday . is there a particular time or departure location you are interested in ?
assistant
i want to depart from london kings cross after 13:30 .
user
sure , the first train leaves at 15:17 . would you like to book it ?
assistant
no , i would like to book at a later time , but can i please get the train id ?