i need a train going to cambridge .
user
where will you be arriving from and on what day ?
assistant
i would like to travel on wednesday and i'll be coming from london kings cross .
user
i have many trains to choose from . do you have a travel time preference ?
assistant
i want to arrive by 20:15
user
the tr9332 arrives by 20:08 . would you like it booked ?
assistant
yes please , for 2 people .