i was wondering if you could help me in finding a train to the airport .
user
sure . where will you be leaving from ?
assistant
i will need to leave from cambridge if that s ok
user
what day are you travelling ?
assistant
on wednesday . i need the train to arrive by 19:15 .
user
i have a train that arrives earlier at 18:08 and 1 that arrives just before your specified time at 19:08 .
assistant
i would like to book 3 tickets on the train arriving at 19:08 , please . and would it be possible to have a reference number for the booking ?