Hello, I need to book a train at 07:15 leaving Cambridge going to the town center on Thursday for 7 people.
Sure I can help with that. There are no trains going to the town centre. Do you have another destination in mind?
Could you check for a bus?
I think we may need to recheck your intended arrival location. To where and from where do you wish to travel?
I am leaving from Cambridge at 14:30.
And where are you going?
I will be going to ely.
What time do you want to arrive by?
Doesn't matter. I just can't leave until 14:30
There is a 15:50 train that will arrive at 16:07.  Does that sound good? 
Does the train depart on Friday? Does it go to Stevenage?
I'm sorry, earlier you said you were going to Ely, but now you're asking about stevenage. What is your destination, please?
For Clarification: From Cambridge to destination Stevenage,, on friday, leaving after 14:30.
sorry about that, how many tickets?
just one person 
There are five available trains, leaving every two hours, starting at 15:21.  Would you like me to book at seat on the earliest train?
Do you know how long the travel time is and the price?
The travel time for all trains is approximately 49 minutes and each ticket costs 12.80 pounds. Would you like me to book you on one?
No, that is all thanks.
You're welcome, let me know if I can assist with anything else.