You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: I am happy to help you, please give me a moment.

USER: Thank you and sure, take your time.

ASSISTANT: Thanks for your time, there is no reservation found on your name to cancel it.

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

ASSISTANT: Thanks for choosing us.