You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you?

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

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: I regret no reservation found by name David Allen.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks.