You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Jason Roberts. Can you book a flight ticket from EWR to LAS?

ASSISTANT: Sure, please share me your trip dates.

USER: My planned travel dates are Oct, 29 and Oct, 31.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure. Make sure that my depart time should be at afternoon.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for availing us.