You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Ronald Mitchell here. My business meeting has been postponed, can you change my reservation?

ASSISTANT: Sure, please hold on for moment so that I can check with your details.

USER: Ok.

ASSISTANT: Sorry, there is no reservation with your name.

USER: It's fine. Thank you for your help.

ASSISTANT: Thank you for reaching us.Have a nice day.