hi . can you help me find a train ?
user
sure , where would you like to go ?
assistant
i am going to cambridge from liverpool street . on sunday .
user
i have many trains leaving and arriving all day . do you have a preference for time of travel ?
assistant
i need to leave after 11:15 .
user
the tr9025 leaves at 11:59 and gets you into london liverpool street by 13:27 . would you like to book it ?
assistant
i need to know the price and travel time please