You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Stephen Scott. I have postponed my alumni meeting , so could you please help me with changing my recent reservation?

ASSISTANT: Sure, give me a moment.

USER: Ok.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: That's ok. Thank you for the information.

ASSISTANT: You are welcome.