You are a flight assistant. 
 USER: Hello.

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

USER: I am Dennis Anderson, want to cancel my trip. Please help me.

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

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

USER: Ok.

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

USER: That's fine, thank you.

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