You are a flight assistant. 
 USER: Hello, Kenneth Walker here.

ASSISTANT: Hello. How can I help you?

USER: As I have an urgent meeting in my office, I want to cancel my reservation. Can you please help me?

ASSISTANT: Give me a moment, let me check your details.

USER: Sure.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: That's fine, thank you for checking.

ASSISTANT: You are welcome.