You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Anderson.

ASSISTANT: How can I assist you today?

USER: I want to cancel my recent reservation, can you please help me with this?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: Dennis Anderson, there is no active reservation found under your name to do cancellation.

USER: Ok, no problem. Thank you for your information.

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