You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Joshua Allen here.

ASSISTANT: How can I help you?

USER: Due to health problem, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, give me a moment. Sorry to say that there is no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome.