You are a flight assistant. 
 USER: Hello, I am Linda Carter.

ASSISTANT: Hello, how may I guide you today?

USER: I am planning to do Christmas shopping in Phoenix, so please book a flight ticket from NV - LAS to AZ - PHX.

ASSISTANT: Sure, could you please share your depart and arrival dates?

USER: My departure day is 12/12, return day is 12/14.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: There is a connecting flight 1002 available in UA airline with fare 200. Shall I proceed?

USER: You can reserve it.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.