You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Evans.

ASSISTANT: How may I assist you?

USER: Due to bad weather, I want to cancel my reservation.

ASSISTANT: Please give me a moment.

USER: Can you please help me with it? Sure.

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

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you.