You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Anna Taylor. I want to change my reservation due to an emergency work in my office. Can you help me to change my reservation?

ASSISTANT: Sure. Wait for a while.

USER: Sure.

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

USER: Thank for informing.

ASSISTANT: Thank you.