You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Myself Ronald Green. Due to some business meeting, I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure. Please, wait for a while.

USER: Sure.

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

USER: Not a big problem, anyway thank you  very much for your service.

ASSISTANT: Thank you for opting us.