You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: My name is Kevin Harris.

ASSISTANT: Ok, wait for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for availing us.