i need a not later than 9:15 train to cambridge .
user
it looks like there s a train for cambridge with an arrival time of 07:07 . would you like me to book that for you ?
assistant
yes , book me for sunday departing from london kings cross .
user
how many tickets will you require ?
assistant
8 , please
user
your booking is successful . train is leaving at 07:17 and it costs 151.04 gbp . your reference number is 5y7xkajy . anything else i can help with ?
assistant
no thank you that s i need !