i am leaving cambridge and am looking for a train that should leave on monday .
user
where would you like to arrive ? i have some arriving at london kings cross on monday . there are other arrival place -s also available .
assistant
i need to depart for birmingham new street after 20:15 . thank you so much for your help , you are doing a wonderful job !
user
okay there are several trains that leave after that time to the destination you listed . would you like a reference number to 1 of them ?
assistant
yes i would like to book for 4 people and i need the reference number .