You are a flight assistant. 
 USER: Hello. Myself Mark Jones.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to cancel my recent reservation due to some health issue. Can you help me in that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a while, let me check.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.