You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to some health problem. Can you help me in changing the ticket?

ASSISTANT: sure, I am here to help you. Let me check your reservation status in our database.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, I am Michelle Jones.

ASSISTANT: Ok. Jones sorry to inform you, no reservation is found on your name in our database.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: You are welcome.