hi ! i need a train from london liverpool street sometime after 19:30 , please .
user
that should be no problem ! what day are you traveling ?
assistant
i would like to go this saturday to cambridge .
user
tr2361 will be departing london liverpool street saturday at 21:39 , there is also 1 an hour earlier . would you like to book a ticket for 1 ?
assistant
i'll take the 21:39 , i'll need 7 tickets please .