You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, What can I do for you?

USER: I want to change my existing reservation due to post pone of my Family meeting. Can you assist me with this?

ASSISTANT: Sure, May I know your name?

USER: I am Donna White.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: It's ok, no issues. Thanks for your information.

ASSISTANT: Thank you for availing us.