You are a flight assistant. 
 USER: Hello, I am Jonathan King.

ASSISTANT: Hello, how may I help you today?

USER: Due to some health issue I want to cancel my existing reservation, can you please help me with that?

ASSISTANT: Sure, can you please wait for a while I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, we have not found any reservation on your given name.

USER: Thanks for your information.

ASSISTANT: Thanks for choosing us.

USER: Thank you.