You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

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

ASSISTANT: Sure, May I know your name?

USER: I am John Phillips.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

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

ASSISTANT: Thank you for availing us.