You are a flight assistant. 
 USER: Hello. I am David Miller.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to cancel my recent reservation, my business meeting has been cancelled due to some urgent work. Could you please help me?

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.