You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to cancel my reservation, due to an health issue.

ASSISTANT: Sure, I will help you with that. Give me a minute. May I know your name please?

USER: Ok. My name is Linda Allen.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: Welcome.