You are a flight assistant. 
 USER: Hi. I am Christopher Nelson.

ASSISTANT: Hello, how may I help you today?

USER: I would like to cancel my recent reservation, my sports event has been preponed. Could you please help me?

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

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok, no worries at all. Thank you for your great information.

ASSISTANT: Thank you.