You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to my business meeting got postponed. Can you help me with this?

ASSISTANT: Sure, may I know your name?

USER: I am Scott Edwards.

ASSISTANT: There is a reservation found with your name, can you please help me with your airport codes?

USER: My new reservation location codes are from TX - AUS to TX - IAH.

ASSISTANT: Kindly mention your travel dates?

USER: I will travel on 12/21 and return on 12/23.

ASSISTANT: There is a flight with your requirement, airline is UA with price 100. Shall I proceed with booking?

USER: Please proceed.

ASSISTANT: Your booking is done.

USER: Thanks for your prompt response.

ASSISTANT: Thanks for reaching us.