You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Donald Davis, want to cancel my recent reservation due to some personal issue. Please help me out with that.

ASSISTANT: Ok, please give a minute.

USER: Sure, take your time.

ASSISTANT: Sorry Davis, there is no reservation found.

USER: It's fine, thank you for your help.

ASSISTANT: Most welcome.