You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Dennis Jackson, no reservation has found under your name to cancel.

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

ASSISTANT: Thank you for choosing us, have a good day.