Hello
Hello, how can I help?
Yes i would like to find and reserve an flight from San Francisco to Detroit with id 639
On what day do you want the plane to arrive?
On Sunday
Is that Sunday, the 27th?
Yes, that is correct i really hope you guys have an open for that day because i really need to book this flight. I'm gioing to my sons graduation
Right, I found a Business flight with Delta for 399 credits
 that takes 4 hours to get to Detroit.
Okay great! Could you tell me what the weather would be in Detroit on the 27th please
It will be Sunny all day on Sunday in Detroit, with temperatures of around 4 degrees celsius.
Okay, thanks. SO you said that you found be a flight that takes 4 hours with Delta correct? 
Yes.
Is it an other flights that not with Delta if not then i understand. I just would like to maybe go with a different airline if possible 
Unfortunately there are no flights that match your search. Would you like to change any of your criteria?
Okay, no worries i will go ahead and book the flight with Delta 
May I have your name, please?
yes its John 
Sorry, but the flight with id '927' is not available any more.
no its id 639
The flight is available. Should I reserve it for you?
yes please
Right, your flight is now reserved!
Thank you do much for your help today. Hope you have a good day.
Thank you and goodbye.