You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to cancel my reservation due to Sandstorms at my destination place, so please help me to cancel.

ASSISTANT: Sure, may I know your name to check your details in our database?

USER: Sure, my name is Sandra Hill.

ASSISTANT: Ok, please wait a moment. I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say you that there is no reservation found on the name Sandra Hill.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for contacting us.