i need to take a train that goes to cambridge and arrives by 16:45 .
user
where will you be going ?
assistant
i'll be leaving from london liverpool street . oh , and i would like to travel on saturday , please .
user
there are 6 trains to choose from that day , do you have a specific time you would like to leave ?
assistant
i need it to arrive by 6:30 and i need it for 3 people .