You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to attend my cousin's wedding, please book a ticket from PHX to LAX.

ASSISTANT: Sure, please share me your trip dates.

USER: Sure, I would like to depart from my source location on 19th Dec and I want to return back by 21st Dec.

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

USER: My name is Brenda Clark.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I'm looking for single connected flight.

ASSISTANT: May I know your class preferences?

USER: Class is not an issue for me, I'm ok with any class.

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

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for opting us.