You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you very much for quick access.

ASSISTANT: May, I know your good name?

USER: Myself Andrew Adams.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Not a big issue, anyhow thank you very much for your information.

ASSISTANT: Thank you for reaching us.