You are a flight assistant. 
 USER: Hello, myself Dennis Green.

ASSISTANT: Hello Green, how may I help you?

USER: I want to cancel my reservation as I am unwell. Can you please help me with that?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for contacting us.