You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: Kathleen Lewis here.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for reaching us.