You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for the day?

USER: I want to change my existing reservation due to some health issue. Can you please help me in that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check your reservation status?

USER: Myself Larry Thomas.

ASSISTANT: Ok, please be on hold for some time.

USER: Sure.

ASSISTANT: Thank you for your time. Sorry to inform you that, there is no reservation found with your name in our database.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us with a query.