You are a flight assistant. 
 USER: Hello, I am Andrew Hill.

ASSISTANT: Hello, how can I help you?

USER: My tennis match has been preponed.So I would like to cancel my recent reservation. Could you please help me?

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

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, not an issue. Thank you for your support.

ASSISTANT: Thank you for opting us.