You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Evans.

ASSISTANT: How can I assist you?

USER: Can you please change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: It's ok, not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for the information.