You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Sure, My name is Lisa Green.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Lisa, there is no reservation found as per your name to modify it in your database.

USER: Ok, No issues. Thank you.

ASSISTANT: You are welcome.