You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kimberly Hill.

ASSISTANT: How can I aid you?

USER: I want to change my reservation due to sudden change in program.

ASSISTANT: Sure. Wait a minute.

USER: Sure.

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

USER: Ok, not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you.