You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you out?

USER: Due to some health problems, I want to cancel my recently done reservation. Can you please help me in this condition?

ASSISTANT: Ok, I can help you out. Can you please tell me your name for further search?

USER: Sure, I'm Dennis Allen here.

ASSISTANT: I'll search for that, before that do you have any requirements like new reservation?

USER: No.

ASSISTANT: Sorry Dennis, no reservation found on your name.

USER: That's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your service.