You are a flight assistant. 
 USER: Hello, I am Ronald Brown.

ASSISTANT: Hello, how can I give assistance to you?

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

ASSISTANT: Sure, we are here to help you to change it.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: OK.

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

USER: No problem, thank you the information.

ASSISTANT: Thank you for choosing our service.