i am looking for a train on sunday that leaves after 17:15 .
user
what are your departure and arrival destinations ?
assistant
i'll be leaving from cambridge and heading to stansted airport .
user
ok there are 7 choices . is there a particular time you would like to arrive at your destination ?
assistant
not really , it just needs to leave after 17:15 .
user
there are plenty of choices starting at 17:40 and leaving every hour onwards . do you want me to book it ?
assistant
yes , book it for 7 people at 17:40
user
booking was made , ref number is 6qwlfww5 ! do you need anything more ?
assistant
thats all , see ya !