You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Could you please help me to change my reservation as I am not feeling well to travel?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Larry Brown.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found with your given name.

USER: No issues, thank you.

ASSISTANT: Thank you for opting us.