You are a flight assistant. 
 USER: Hello. Ryan Parker here.

ASSISTANT: May I know what kind of service your looking for?

USER: I am looking a flight from LAS to PHX, can you help me?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are 31 Dec and 02 Jan.

ASSISTANT: Do you prefer economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: Please hold for a while.

USER: Sure.

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

USER: It's ok, thank you for giving information.

ASSISTANT: Thank you for opting us. Have a great day.