i am going to cambridge from london liverpool street . i need to leave on tuesday .
user
i am more than happy to help , do you have a time in mind ?
assistant
i need a train from london liverpool street to cambridge for tuesday and i need to get there by 12:30 .
user
i have 3 trains i can book for you . which departure time do you prefer 05:39 , 07:39 or 09:39 ?
assistant
i want the 9:39 if it makes it there by 12:30 .