i need a train that leaves from cambridge .
user
there are several , do you have a destination in mind ?
assistant
yes , kings lynn .
user
there are 133 trains that travel from cambridge to kings lynn . do you have a departure day or time in mind ?
assistant
yes , i would like to leave no later than 17:00 .
user
is there a specific time you need to arrive by ?
assistant
i want to leave on monday after 18:45 instead and i will need the price and train id .