i am looking for a train to leicester on tuesday .
user
there are 19 trains going to leicester tuesday , where are you departing from and what time would you like to leave or arrive ?
assistant
i am leaving cambridge and i need to be there by 16:15 .
user
ok , the tr1997 arrives at 16:06 . would you like to book that train ?
assistant
i would , but i still need the departure time .
user
i have several departure times , when would work best for you ?
assistant
when does tr1997 depart ?