You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Ronald Parker. I want to change my existing reservation due to postpone of my friend engagement.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: No issue, thank you for your help.

ASSISTANT: Thank you.