i need to find a train going to cambridge from london kings cross .
user
there are 70 trains meeting those requirement -s . what day of the week are you leaving ?
assistant
i need to leave on saturday and arrive by 17:00 .
user
i have a train that fits your criteria saturday , it leaves at 05:17 and arrives at 06:08 . would you like me to book it for you ?
assistant
no , i need to arrive by 5:00 no 6:00 can you check the schedule again ?