You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mary Wright.

ASSISTANT: How can I assist you?

USER: I need  to cancel my existing reservation due to some health issue. Can you please help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our reservation list.

USER: It's ok, no problem. Thank you for your response.

ASSISTANT: Thank you for choosing us, have a nice day.