You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you assist me in booking a flight ticket from PHX to LAS.

ASSISTANT: May I know your travelling dates to get a flight for you?

USER: I preferred to travel in between Dec 24 and Dec 26.

ASSISTANT: Do you have any airline preferences?

USER: No, but make sure to book in business class.

ASSISTANT: Is there any other requirements?

USER: I need to depart in afternoon.

ASSISTANT: May I know your name?

USER: I am Jacob White.

ASSISTANT: Sorry, we don't have any flight available for your trip.

USER: Ok, not an issue. Thanks for you response.

ASSISTANT: Welcome Jacob White.