You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Actually my meeting schedule is changed so that I want to cancel my recent reservation , can you help?

ASSISTANT: Sure, I will help you with that. May I know your good name please?

USER: Yes, I am Sandra white.

ASSISTANT: Sorry, there is no previous reservation found for you.

USER: Ok, that's fine.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help.