You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to cancellation of my meeting, I want to change my existing reservation.

ASSISTANT: Sure. Can I know your name?

USER: My name is Donald Clark.

ASSISTANT: OK. Sorry to inform you that there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.