You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your name please?

USER: My name is Ryan Roberts.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Roberts, there is no reservation found as per your name in our database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us with a query.