hello . i need to catch a train leaving on monday . can you help me find something ?
user
yeah sure but you need a departure and arrival city and time .
assistant
i am going to london liverpool street from cambridge and should arrive there by 12:45
user
tr5431 fits your criteria and will arrive at 01:27 . would you like me to book that for you ?
assistant
yes , could you book 3 tickets and provide the reference number please .