You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Dorothy Allen. Could you help me in booking a flight ticket from Charlotte to Austin on Dec 09?

ASSISTANT: Sure, when do you want to return?

USER: I want to return on Dec 11.

ASSISTANT: Ok, Kindly mention your journey airport codes.

USER: My source and destination airport codes are CLT and AUS.

ASSISTANT: Ok, Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Thank you for providing details, we found a connecting flight in 1022 UA airline with a fare of 100. Can I proceed for booking?

USER: You can reserve it.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.