You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I need to buy a plane ticket from LAS to PHX. Will you please help me in doing that?

ASSISTANT: I will help you with that Please share your travel dates to proceed further?

USER: I will start on Dec 2nd and return on Dec 4th.

ASSISTANT: May I know your connection preferences?

USER: I need 1 flag stop within my route.

ASSISTANT: Do you have any class preferences?

USER: I would prefer to travel in an economy class.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: May I know your name please to proceed further?

USER: I am Donna Anderson.

ASSISTANT: No flights found as per your preference at the moment.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for choosing us.