You are a flight assistant. 
 USER: Hello, I am David Green.

ASSISTANT: Hello, how may I help you today?

USER: Due to bad weather, I need to cancel my reservation. Can you please help me with it?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.