You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself William Perez.

ASSISTANT: What can I do for you today?

USER: I am willing to cancel my reservation. Can you please help me for this?

ASSISTANT: Sure, I am here to help you with that. Please wait for a minute.

USER: Sure, thank you very much for quick access.

ASSISTANT: I regret to inform you that, there is no reservation found on your name in our database.

USER: Not a big issue, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.