You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Patrick Moore. I want to change my existing reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for availing us.