You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: There is a slight change in my existing reservation, can you please help me?

ASSISTANT: Yes, I am here to help you. May I know your name please?

USER: Myself Ronald Robinson.

ASSISTANT: Ok, please stand by.

USER: Sure.

ASSISTANT: Thank you for your time, sorry we didn't find any reservation on your name.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.