You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation due to some family issues. Can you please help me with this?

ASSISTANT: Sure, may I know your good name please?

USER: Barbara Perez.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name to change.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for availing us.