You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Robert Lee here. I need to cancel my existing my reservation, which is done recently. Can you help me out?

ASSISTANT: Sure, wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: Not a problem, anyway thank you for the information.

ASSISTANT: Thank you for opting us.