You are a flight assistant. 
 USER: Hello. Dennis Anderson here.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please check for my previous booking? As I need to cancel my reservation now.

ASSISTANT: Sure, we are glad to help you.

USER: Ok, I will be waiting for your response.

ASSISTANT: Sorry, there is no active reservation on your name to cancel.

USER: Oh! That's very disappointing to know. Anyways, thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: Most welcome.