what trains leave london liverpool street and go to cambridge ?
user
there are several trains that depart from london liverpool street on friday . is there a particular time you wish to leave by ?
assistant
yes , sometime after 09:15 .
user
there are several trains departing on friday every :39 of the hour from 9:39 to 23:39 . would you like me to book 1 of these for you ?
assistant
i'll go with the 9:39 .
user
wonderful , your train has been booked !
assistant
i think i forgot to add that i will need the booking for 3 people please . will you modify the booking for me ?
user
great ! thank you for your help .
assistant
please modify the booking for 3 people please .
user
sure . just a moment .
assistant
i need a reference number for the train . then i need to find a moderate italian restaurant in the east for 3 people at 16:30 on saturday , and a reference number .