You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: I need to cancel my ticket due to my health issue, can you help me with that?

ASSISTANT: Ok, may I know your good name to proceed further?

USER: I am Margaret Hernandez.

ASSISTANT: Ok, please allow me to check with your booking for a moment.

USER: Sure.

ASSISTANT: Margaret Hernandez, I am sorry to say there is no flight reservation by your name. Thank you for choosing our services.

USER: That's ok. Thank you for your service.

ASSISTANT: Have a great day ahead.