You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Could you please change my existing reservation due to postpone of my trip?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Susan Moore.

ASSISTANT: Ok, please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry no reservation found on your name.

USER: Not a problem, thank you for your infromation.

ASSISTANT: Thank you for reaching us, have a good day.