You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Carlo Taylor, I want to change my reservation as my plan to meet my friend is postponed.. Can you help me with that?

ASSISTANT: Sure, I am here to help you. Sorry, there is no reservation found on your given name.

USER: Ok, thank you for the details.

ASSISTANT: Thank you for opting us.