You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to cancel my recent reservation,due to health issue. Can you please help me out?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: My name is Jack Smith.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for contacting us.