You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Ryan Mitchell.

ASSISTANT: How may I guide you?

USER: Due to sudden change in the plan, I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you. Please hold on a moment.

USER: Ok.

ASSISTANT: I have found your reservation, please help me with your airport codes.

USER: The airport codes are SEA and LAS respectively.

ASSISTANT: May I know your planned dates?

USER: I am planning my journey on dates 09/25 and 09/27.

ASSISTANT: I found a flight for you in AA airlines with price 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Ok, your ticket has been confirmed with flight number 1005.

USER: Thank you for your assistance.

ASSISTANT: Thank you for approaching us.