You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I'm Daniel Taylor, I would like to cancel my reservation due to sudden change in my journey. Please, assist me about it.

ASSISTANT: Sure Daniel, please give me a moment to check.

USER: Ok, sure.

ASSISTANT: Sorry Daniel, there is no reservation found in our records.

USER: Not an issue, thank you for the information.

ASSISTANT: You are most welcome.