You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to reserve my ticket from JFK to LAS, can you please help me in booking?

ASSISTANT: Sure. Tell me your travel dates please?

USER: Sure, my willing to travel dates are from Dec, 20 to Dec, 22.

ASSISTANT: May I know your name please?

USER: Sure, my name is Ronald Baker.

ASSISTANT: Any other preferences?

USER: Yes, I want to return at morning time.

ASSISTANT: Please wait.

USER: Sure. I need a normal cost airline preference.

ASSISTANT: Ok. Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you.