i am looking for a train leaving on wednesday arriving by 16:00 .
user
okay . what is your destination ?
assistant
i am going to be leaving from london liverpool street and travelling to cambridge .
user
sure , i can help with that . how close to 16:00 would you like to arrive ?
assistant
it does not matter . just tell me when it departs so i can be there on time .
user
the best option for you is the train arriving at 15:07 and leaving at 13:39 . would you like me to book that for you ?
assistant
not just yet . could you give me the train id , though ?
user
the train id is tr2826 . is there any other thing i can help you with ?
assistant
i need a moderate -ly priced guesthouse .
user
how about a and b guest house ? it looks lovely
assistant
sure can you book that for 7 people for 5 nights starting friday ?