You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I just want to cancel my recent reservation, due to some health issues. Can you please help me with cancellation?

ASSISTANT: Let me know your name?

USER: Sure, Kenneth Smith is my name.

ASSISTANT: Sorry, no reservation found by name Kenneth Smith.

USER: Ok, thanks for your service.

ASSISTANT: Thank you. Have a nice day!.