Hello.
user
Hello.
assistant
I am David Parker.
user
How can I assist you for the day?
assistant
I am planning to visit New York, can you please book me the ticket from OAK to JFK?
user
 Sure, I am here to help you with that flight ticket booking. May I know your  preferable travel dates, please?
assistant
My preferable journey dates are from 11/10 to 11/12.
user
Sorry to tell you that, there are no flights available as per your given travel dates.
assistant
Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.
user
You are welcome, thank you for approaching us.
assistant