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

ASSISTANT: Hello, how may I help you?

USER: I would like to cancel my recent reservation now. Can you help me?

ASSISTANT: I am happy help you, please hold on a moment.

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

ASSISTANT: Sorry to say, there is no reservation found on your name to cancel it.

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

ASSISTANT: Thanks for contacting us.

USER: Most welcome.