You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, kindly mention your name?

USER: My name is Dennis Davis.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: Ok, not an issue. Thank you for informing me.

ASSISTANT: Thank you.