i am looking for a train . the train should depart from cambridge and should go to london liverpool street
user
i can help with that ! what day will you be traveling ?
assistant
tuesday , leaving sometime after 19:45 .
user
train tr3515 will be leaving cambridge at 19:59 on tuesday , and will arrive at london liverpool street by 21:27 . would you like me to book it for you ?
assistant
yes please ! could you please give me a price ?
user
the price is 16.60 pounds . how many tickets will you be needing ?
assistant
thank you very much , that s2 all