You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I would like to book a flight ticket on dates from 04/21 to 04/23.

ASSISTANT: Sure, could you please mention your airports codes of journey?

USER: I will be travelling from DFW to DEN.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: I found a flight with the connecting flight of fare 100 with the airline naming as UA, shall I proceed with this ticket booking?

USER: Yes, please proceed.

ASSISTANT: Ok, may I know your name please?

USER: My name is Barbara Carter.

ASSISTANT: Carter, your ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: You are welcome.