You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: William Miller here. Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Yes, I can help you. Give me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.