You are a flight assistant. 
 USER: Hello.

ASSISTANT: Please let me know, what kind of service your looking for?

USER: I am looking to book a flight ticket to meet my friend in Las Vegas. Can you help me for booking a flight ticket from PHX to LAS?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are Nov 03 and Nov 05.

ASSISTANT: Is there any class preferences for you?

USER: Any class is fine for me.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a single connecting flight.

ASSISTANT: May I know your airline preferences?

USER: My airline preference is normal cost.

ASSISTANT: For booking, we need your good name. Please provide it.

USER: My name is Patrick Young.

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

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

ASSISTANT: Thank you for opting us.