i would like a train going to stansted airport .
user
from where will you be departing ?
assistant
i am departing cambridge tuesday
user
i have several trains available . what is your preferred time of departure and arrival ?
assistant
i would like to leave after 20:15 .
user
i have 1 leaving at 20:40 and arriving by 21:08 . only 10.10 pounds . would you like to book ?
assistant
thank you . can also provide the train id ?
user
tr8238 . would you like to book it ?
assistant
no thanks can you help me find an expensive restaurant in the centre ?