You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you please change my existing reservation from HOU to LAS in origin code?

ASSISTANT: Sure, may I know your good name?

USER: Myself Susan Gonzalez.

ASSISTANT: Please wait for a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your name.

USER: Ok, fine thank you for your information.

ASSISTANT: Thanks for choosing us.