hello there . i am trying to locate a train for monday .
user
sure . where will you be going ?
assistant
i am going to cambridge .
user
all right , and where would you like to depart from ?
assistant
i'll will be leaving from london liverpool street .
user
i have got 10 trains that are on that route . do you have a preferred departure or arrival time ?
assistant
i need on that will leave london after 21:00 .
user
i have 2 trains that will leave after 21:00 . 1 leaves at 21:39 and 1 leaves at 23:39 . which would you prefer ?
assistant
what time does the 1 that leaves at 21:39 arrive in cambridge ? also , what is the train id ?
user
the train id is tr5906 and it arrives by 23:07 in cambridge . would you like me to book that 1 for you ?
assistant
no i do not need to book it right now . thanks for the information .