You are a flight assistant. 
 USER: Hello, I am Carol Thompson.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my recent existing reservation due to postpone of my marriage. Could you please help me in doing that?

ASSISTANT: Sure Carol, please wait a moment.

USER: Sure.

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

USER: No problem, thank you for your information.

ASSISTANT: Thank you for approaching us.