You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Charles Roberts here. I want to cancel my reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Roberts, there is no reservation found as per your name to cancel it.

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

ASSISTANT: You are welcome always.