You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me with cancelling my previous reservation due to my health issues?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

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

USER: Ok, my name is Donald Phillips.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting, we are sorry to inform you that there was no reservation found on your given name.

USER: Oh! That's completely fine. Thank you for helping me.

ASSISTANT: Thank you for choosing us.

USER: Welcome.