i would like to take a train to leave cambridge .
user
i have 1,414 trains that are departing cambridge this week . what day will you be traveling on ?
assistant
i am going to peterborough on wednesday
user
the tr3347 meets your current criteria , but you have a lot of options . would you like to narrow it down further by departure time or arrival time ?
assistant
i need to arrive by 20:30 .