You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Ronald King.

ASSISTANT: Ronald, how can I assist you?

USER: Due to an emergency, I am unable to attend a meeting. Could you help me in changing the reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check the details. Sorry Ronald, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for your time.

ASSISTANT: You are welcome.