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

ASSISTANT: Hello, how may I assist you today?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, we are glad to help you to change it. Please wait for a couple of minutes.

USER: OK.

ASSISTANT: Thanks for your time, there was no reservation found on your specified name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing our service.