You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to an emergency work, I want to change my reservation. Can you help me?

ASSISTANT: Sure, may I know your good name?

USER: Joshua Clark here.

ASSISTANT: Thank you for providing your good name, please hold on.

USER: Ok.

ASSISTANT: No reservation found on your name.

USER: No issue, Thank you.

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