You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.