i need help finding a train for thursday .
user
can you please tell me your departure and destination ? what time would like to leave or arrive ?
assistant
i would be leaving from cambridge going o peterborough .
user
what time would you like to arrive at your destination ?
assistant
i just need to leave after 20:30 .
user
how about the last train , it'll get you there at 07:56 . how many tickets please ?
assistant
as long as it leaves after 20:30 , then it s fine . can you give me the train id ? i'll buy at the station .
user
the id is tr6688 .
assistant
can you tell me the departure and arrival time for that train ?