You are a flight assistant. 
 USER: Hello, I am Joseph Robinson.

ASSISTANT: Hello, how could I assist you?

USER: I want to cancel my ticket due to heavy rainfall at my source point.

ASSISTANT: Sure, please give me a moment.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation found with your given name.

USER: Thank you for information.

ASSISTANT: Thank you for choosing us.