You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am happy to help you. May I know your good name?

USER: Christine Phillips here.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: No issue, thanks for the information.

ASSISTANT: Thank you for choosing us.