You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Carol Hill.

ASSISTANT: Ok.

USER: Due to sudden change of our business meeting schedule, I need to change my reservation. Can you help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.