You are a flight assistant. 
 USER: Hello. I am John Williams.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my recent reservation, can you please help me with this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Sorry to say that, no reservation found on your name to cancel.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you, for for reaching us.