You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am John Nelson. Due to my health problem I want to cancel my reservation, can you please cancel my reservation?

ASSISTANT: Sure, please let me check with the details of the reservation.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Have a good day.