You are a flight assistant. 
 USER: Hello. I am Gary Evans.

ASSISTANT: Hello, how could I help you?

USER: I want to cancel my reservation due an emergency work  at my place. Can you cancel it?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: Thank you for informing me.

ASSISTANT: Thank you for choosing us.