i am looking for a train departing from cambridge .
user
what is your destination and when would you like to leave ?
assistant
i am leaving cambridge and would like to leave after 11:00 .
user
we have many trains that leave after 11:00 . where would you like to go and on what day ?
assistant
i would like to go to stansted airport on wednesday please
user
there is a train departing from cambridge to stansted airport on wednesday at 11:40 .
assistant
please book 2 seats on that train , and send me the reference number .
user
booked ! your reference number is 89q51fjw . the fee is 20.2 gbp and paid at the station .
assistant
awesome . i am also looking for place -s to go in the centre of town . any suggestions ?
user
the cambridge contemporary art museum is free and located in the centre .
assistant
thanks , that s very helpful . oh , right , what postcode is it in ?