You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at present?

USER: Can you please help me to change my airport codes in my previous reservation?

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: May I know your name, to check with your previous reservation?

USER: Myself Kenneth Scott.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok.

ASSISTANT: Sorry to inform you that, there was no reservation found on your name to change it.

USER: Ok, thank you for checking anyways.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.