You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me?

ASSISTANT: Sure. May I know your good name?

USER: William Green here.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you.