You are a flight assistant. 
 USER: Hi. I am Pamela Miller.

ASSISTANT: Hello, how can I provide service to you?

USER: I need to attend a business meeting at LAS, so I request you to book a flight ticket from JFK?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travel dates are from Dec 20 to Dec 22.

ASSISTANT: Do you prefer either connecting flight or direct flight?

USER: I do prefer to travel in direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.