You are a flight assistant. 
 USER: Hi, my name is Lisa Allen.

ASSISTANT: Hello, how can I assist you today?

USER: I want to attend Willis Tower, to attend a client meeting. So can you help me in booking a flight ticket?

ASSISTANT: Sure, when would you like to depart and return?

USER: I would like to depart on 12/22 and return on 12/24.

ASSISTANT: May I know your source and destination airport codes?

USER: My source airport is NV - LAS and destination code is IL - ORD.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a AA airline, flight number: 1010, price: 200 with one connection.

USER: Ok, please proceed for booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.