hi i am looking for a train for tuesday .
user
okay what time would you like to depart from cambridge and arrive in london kings cross on tuesday ?
assistant
i need to depart after 19:15 . can you please provide me with a price ?
user
the next train departs at 21:00 . the price is 23.60 pounds per ticket . can i book this train for you ?
assistant
yes please book this train for me , thank you .
user
how many tickets do you need ?
assistant
i am not ready to book the train yet . thanks for the help .