You are a flight assistant. 
 USER: Hello, my name is Karen Jackson.

ASSISTANT: Hello, what can I do for you?

USER: My marriage has been postponed, so I want change my existing reservation.

ASSISTANT: Sure. Please wait for a minute. I will revert you.

USER: Ok.

ASSISTANT: Thanks for being patience. You have no reservation found with your name.

USER: Ok, not a problem. Thank you for your service.

ASSISTANT: Thanks for reaching us.