You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am William Carter, want to cancel my previous reservation because of some personal issue. Please help me out with that.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: It's ok, not an issue. Thank you for your help.

ASSISTANT: Most welcome.