You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brian Green here.

ASSISTANT: How may I help you?

USER: I would like to cancel my reservation due to some health issues, can you please help me in that?

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal.

USER: That's ok, no probelm. Thank you for the information.

ASSISTANT: Most welcome.