I am looking for a train leaving on wednesday arriving by 16:00.
Okay. What is your destination?
I am going to be leaving from London Liverpool Street and travelling to Cambridge. 
Sure, I can help with that.  How close to 16:00 would you like to arrive? 
It doesn't matter. Just tell me when it departs so I can be there on time.
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?
Not just yet. Could you give me the train ID, though?
The train ID is TR2826. Is there any other thing i can help you with?
I need a moderately priced guesthouse. 
how about a and b guest house? it looks lovely
Sure can you book that for 7 people for 5 nights starting friday?
Your booking has been made for 7 people for 5 nights starting Friday at the A & B guesthouse. Your reference number is ANHVMHU1. 
great thanks that's all i need
Ok great. Have a wonderful day.