i am looking for a train to cambridge .
user
alright , what day are you looking to travel ?
assistant
i want to travel this sunday , please .
user
okay , and what time do you want to leave ?
assistant
i need to leave after 19:15 .
user
i have several trains that meet that criteria , where are you departing from ?
assistant
i will be leaving london kings cross .
user
tr1681 will be departing london kings cross at 19:17 , would you like to reserve a seat ?
assistant
yes , thank you . can you book it for 3 people and provide the reference number for me ?