You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am David Taylor. Owing to an emergency I want to cancel my reservation, can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Sorry Taylor, there is no reservation found as per your name to cancel it.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome.